Richard Castle should be pleased: A big movie star (played by 'That '70s Show's' Laura Prepon) will be his heroine in "Heatwave" -- the film adaptation of his book series featuring the character Nikki Heat.

But it's NYPD Detective Kate Beckett -- Castle's muse for Nikki -- who inspires Natalie Rhodes. "You are exactly what I expected Nikki Heat to look like," she gushes to Beckett on 'Castle' (Mon., 10PM ET on ABC). "I'm very method, so it's all about getting inside of you, which starts with observing and noting."

"Observe and note away -- I'm already used to it," she says dryly, in Castle's direction.

As for the author/screenwriter, Rhodes isn't starstruck in the least. "I wrote 'Heatwave,'" Castle tells her. She replies, "Oh, I thought your name sounded familiar..."

Rae Ann Carter (Lucy Liu) has always wanted the fairy-tale romance. On 'Marry Me' (Mon., 9PM ET on LIFETIME), she's in demand, having received three marriage proposals from three different men. And now she finds herself in a castle -- how much more romantic can it get?

Well, she's trapped in a castle, of sorts. When Luke and Immy find her, she explains, "I broke the key off in the lock... Just get me out of here!"

Luke stops to ponder strategy. "Are you really going to spend time on this? Take it off its hinges! It's in every action movie ever made," says Immy. Luke replies, "OK, Bruce Willis."

But this is a rom-com TV movie, and that proves to be much easier said than done. However, lucky for Rae, she still gets some romance: Her handsome prince rescues her in the end.

It's time to exchange Christmas gifts on 'Mike & Molly' (Mon., 9:30PM ET on CBS). She opens hers, pulling out a diamond bracelet. "You can't afford this," she says to Mike. He replies, "Not a problem. I put it on a credit card, and I can pay it off in 110 easy payments."

Molly: "That's like nine years!"
Mike: "I don't care ... I love you, and you can't put a price on love."

Wait a minute... he just said that all-important three-word phrase for the first time. "You love me?" she asks. Mike says, "Yeah. Is that OK?" It certainly is, but she still doesn't "want to spend the rest of our lives paying off my first Christmas present."

Mariah Carey's second Christmas album ('Merry Christmas II You') debuted last month. On an accompanying holiday special, 'Mariah Carey: Merry Christmas to You' (Mon., 9PM ET on ABC), it was clear she's still got the skillz.

A spirited 'O Holy Night' had the audience clapping and cheering before the song ended. As a gospel choir sang backup, Carey showed off her famous five-octave vocal range. "O night, di-viiine," she sang, hitting one of her trademark notes into the stratosphere.

It's the moment of truth. Will Kendra Wilkinson follow hubby Hank Baskett to Minnesota, or follow her career and move to Los Angeles? On 'Kendra' (Sun., 10PM ET on E!), Baskett is playing football for the Vikings; his wife misses him greatly. But we already know what she decides...

She explains to him, "I need you as my husband, but I also need to find some independence with myself, too. I feel like a NFL wife," Wilkinson says, using air quotes. She doesn't want to move wherever he moves for his career. "We're gonna have to be apart, Hank."

Baskett isn't pleased with the separation. "I know I won't get to see his first steps," he says of their 1-year-old son.

In part one of the TV movie 'Marry Me' (Sun., 9PM ET on LIFETIME), Rae Ann (Lucy Liu) discovers that -- very suddenly -- she's a wanted woman. As in, wanted in marriage.

She and her family are waiting in a hospital's maternity ward when Luke gets down on one knee. Her mother squeals, "Look what's about to happen!" But she assures her mom he's not about to pop the question.

"Rae, will you go on a first date with me?" he inquires. She chuckles and answers, "Yes." He continues, "And then, will you marry me?" and whips out a huge engagement ring.

Her mother screams in the background as he slips the ring on Rae's finger. She's utterly speechless. Just then, Jeff runs into the room and shouts, "It's a girl!" The ultrasound was wrong. The family rushes down the hall to see the new mom and baby, leaving Luke still down on one knee, waiting for Rae's reply.

(The film's last half airs tonight.)

Last month Todd Ricketts was recognized while working for the Chicago Cubs on 'Undercover Boss' (Sun., 9PM ET on CBS). In the latest episode, the true identity of another incognito boss is leaked, this time that of Johnny Rockets CEO John Fuller.

Fuller is working the front of a restaurant when the in-laws of the franchise's owner sit down at the bar. Fuller remembers meeting them a few months ago; they recall it, too. "You look like somebody else ... the CEO of the Johnny Rockets," says the woman, loudly. His trainer Claudia overhears.

When Fuller hands them their drinks he whispers, "You've gotta protect me on this ... You don't know me after this."

On 'Homemade Millionaire' (Fri., 10PM ET on TLC), host Kelly Ripa and the HSN judges were impressed with both Jennifer Martinson's "Magic Dress" invention and Carissa Brown's clothing line for busty gals.

However, only one could win, and the Magic Dress was chosen to sell on HSN. Carissa was perhaps the perkiest, most gracious loser ever, saying, "I gave it my all and this opportunity didn't go in my favor but a lot more opportunities will. I can go home, and focus on my business, keep up the hard work."

The inventor added that "HSN or not," her Carissa Rose Designs would continue.

On 'Bridalplasty' (Sun., 9PM ET on E!), each contestant writes wedding vows to her fiancé. If what she vows matches what he thinks she will say, she wins the challenge and is a step closer to winning some free surgery.

Lisa Marie starts weeping as she recites hers, calling Derek "the prince of my dreams ... You are my light that shines as bright as the kingdom of our Lord, his creation of the sand and sea."

Derek has a very different take on the proceedings, thinking she will "vow to give me a full-body massage at least once a week" and "make me breakfast in bed."

Lisa Marie is horrified: "This is scary. Not only did I get kicked in the face, but I feel terrible knowing that Derek and I didn't match any of our vows."

Though Kendra Wilkinson's hubby Hank Baskett got dumped from the Philadelphia Eagles on last week's 'Kendra' (Sun., 10PM ET on E!), he promptly got signed to the Minnesota Vikings. Time for his first game with the team: the moment of truth.

In the fourth quarter, he drops a pass. "He's done! I can't watch this anymore!" wails Kendra. She's told, "If you would calm down and wait, he's still out on the field!"

And 13 minutes remain in the game. But Kendra starts to cry. "I had so many emotions all bundled up in one," she explains. Jeez, pull yourself together!

In episode one of 'The Hasselhoffs' (Sun., 10PM ET on AETV), the Hoff doesn't shy away from addressing the infamous "hamburger incident" -- wherein one of his daughter's filmed the recovering alcoholic mid-relapse, as the inebriated actor clumsily at a hamburger and writhed, shirtless, on the floor.

In the series premiere, a fellow student in his daughter's college psychology class asks the actor how he deals with negative press, including the release of that videotape.

"It broke my heart because my child was involved," Hasselhoff said of the tape's nationwide broadcast. "With all the kind of negative press that I get because of being an alcoholic, [if] people can look at that and realize that someone in their family has got the same problem and it can help, maybe that's why it happened ... Sometimes life gives you a wake-up call."

Henrik Slipsager is president/CEO of ABM Industries, a facilities contractor offering janitorial, parking and security services for companies across the nation. During his disguised stint on 'Undercover Boss' (Sun., 9PM ET on CBS), he washes skyscraper windows and cleans toilets. But his first task is driving an airport shuttle bus with trainer Kenny.

Henrik is slow to help passengers with their bags and complains about how heavy they are. Before moving to the next terminal, Kenny says, "I'm gonna tell you, you broke all the rules, man ... You gotta move faster." Then, instead of correctly reporting his whereabouts to the dispatch office, Henrik cusses.

Kenny is exasperated: "Everybody in the airport is hearing you! You will go back to the garage. I have to pull you off the seat." Fired on day one.

Was Sarah Palin adding her take to the national Wikileaks discussion or just promoting her new book? Through her Twitter account, she wrote, "I recently won in court to stop my book 'America by Heart' from being leaked, but US Govt can't stop Wikileaks' treasonous act?"

On 'The Daily Show' (weeknights, 11PM ET on COM), Jon Stewart noted, "She was forced to use 18 of her 140 characters to get in the full title of her book ... Not that I would accuse the ex-governor of using a political issue to shamelessly plug her book. Although if you do enjoy scurrilous accusations like that, you'll love 'Earth' the book." He then shamelessly plugged the 'Daily' hardback.