Demi Lovato will guest on an upcoming episode of 'Grey's Anatomy.' The Disney teen sensation broke the news yesterday on Twitter, saying, "I'm so thrilled to announce that this week I'm shooting Grey's Anatomy!!!!!!!! :D AHHH!!!!" Further details on Demi's guest spot have yet to be revealed, so keep checking Twitter. [PEOPLE]

More casting news after the jump.

Are you ready for some major disaster film effects? Were you disappointed that there wasn't more destruction when the Golden Gate Bridge broke in half on Eli Stone (I was.) Then you, like me, will be pleased to hear that David James Elliott is starring in a four-hour mini-series called Impact. Producers are promising lots of action and Charlton Heston-like epic disaster. Okay, maybe I added the Charlton Heston adjective, but at $13 million, the guys at Muse Entertainment, Jaffe/Braunstein Entertainment and Tandem Communications aren't skimping.

Casting David is a plus for starters. The former JAG star has a nice balance of serious and tongue-in-cheek, so hopefully he'll keep Impact from getting too cheesey. The story, however, does have Velveeta potential.

Since the JAG series finale, many fans have been waiting for David James Elliott to return to TV. The actor eventually did when he landed the role of James Conlon in the CBS series Close to Home. His stay on the show was cut short when the series was canceled at the end of its second season (DJE appeared in 22 episodes of the series). Since then, the actor vanished from the small screen and fans have been patiently waiting (and watching reruns of JAG) for his return. But fans can now rejoice as Elliott returns to TV this week. The catch? It airs on a Canadian network!

JAG was one of the great mysteries of modern television. I watched the first season, and kinda liked it, but then stopped watching it. It lasted for another 27 years, even though I've never spoken to anyone who ever watched it, and it wasn't really talked about that much.

Anyway, the first season of the show is finally coming out on DVD. It will be six DVDS, and these will be episodes from when it was on NBC (it later went to CBS when NBC canceled it - fools!). Paramount will release the set on July 25, complete with a couple of featurettes on the making of the show, plus a commentary from creator Donald Bellisario on the pilot ep.

[via TV Tattle]