Unrequited love can be a real problem, especially in the world of teenage angst that we know as '90210' (Tue., 8PM EST on CW).

It's a complicated triangle of love and lust in Beverly Hills. Navid has moved on from Adrianna, leaving Adrianna crushed, so she finds comfort in talking to Gia about her feelings, but there's a problem -- Gia has a crush on Adrianna.

Hearing your friend blabber on and on about their ex is bad enough, but when you have a crush on said friend, it's rough. We feel for you Gia, we've all been there at one point ... probably during high school.

Catch the video after the jump.

It's the oldest ploy in the book. You see your ex with someone else and want to make them jealous by kissing someone.

But sometimes, the other person jumps in without being asked, as was the case on '90210' (Tue., 8PM ET on The CW) when Gia got a wet one planted on her as her ex looked on from across the room.

And is Rumer Willis the cutest thing since the Shiba Inu Puppy Cam or what? She's just adorable.

Watch the video after the jump.

We hate to be the one to start a Rumer, but here's one we'll pass along: Rumer Willis, whose lesbian character Gia made a couple blink-and-you'll-miss-it appearances on '90210' earlier this season, will be returning in a major way -- for a romance with a main (and straight) character.

According to Entertainment Weekly, Gia, who works on the school newspaper, will be hooking up with teen mom and fellow journalist Adrianna, played by Jessica Lowndes. Though to hear the producers tell it, this won't be just a simple sweeps week hook-up.

Mekhi Phifer and Jennifer Beals return to 'Lie to Me,' Rumer Willis joins '90210,' Neil Patrick Harris will host another awards show and more of today's top TV headlines.

May sweeps has officially arrived. For TV fans that means a full month of explosive season finales, jaw-dropping cliffhangers and -- best of all -- a long list of famous guest stars from both the big and small screens.

Among the A-listers you'll see this season: a daytime TV queen (Elisabeth Hasselbeck), a 'Star Trek' icon (Leonard Nimoy) and a two-time Oscar winner (Jodie Foster) who will finally let Maggie Simpson do the talking.

Check out our guest stars gallery to see when all of Hollywood's finest will be sweeping their way onto your favorite TV shows.