You'd never know this is a man who is about to get divorced from his wife of six years!

Ashton Kutcher received a visit from former That '70s Show co-star Laura Prepon while he shot Two And A Half Men in Burbank yesterday, and despite the fact that he's splitting from Demi Moore, Ashton couldn't stop smiling. Laura has known Ashton for years -- the two worked together from 1998 to 2006, and while we're not suggesting there's something romantic going on between these two pals, we haven't seen Ashton this happy in a long time!

"Ashton was in such a good mood when Laura was there — smiling and laughing," a photographer on the scene tells X17online exclusively. "She seemed to make him forget his troubles with Demi."

Laura visited for about 20 minutes in Ashton's private trailer, and we're not sure what she did to cheer up the 33-year-old star, but maybe he should hire her as his therapist!

That 70's Show's Laura Prepon will play late night host Chelsea Handler in the upcoming NBC comedy Are You There, Vodka? It's Me, Chelsea.

The show, based on Handler's book, will star Prepon, 30, as a single cocktail waitress who dishes about her love of booze and sex.

Dharma & Greg co-creators Dottie Zicklin and Julie Larson will executive produce the show along with Handler.

As for Prepon, she starred in ABC's October Road and most recently has filmed cameos for Castle and How I Met Your Mother.

See Laura Prepon as Donna in That 70's Show ... after the jump.

How packed was the Maxim 100 Party last night? Just take one look at this massive guest list:

*deep breath*

Deana Brewster, Amanda Beard, Masi Oka, Ashley Green, Bai Ling, Nikki Sixx, Kat Von D, Amanda Bynes, Travis Barker and Shanna Moakler, Caroline D'Amore, Evan Ross, Joe Francis, J.C. Chasez, Laura Prepon, Audrina Patridge, Tila Tequila, Ian Ziering, Steve-O (clean and sober, too!), Stacy Kiebler, Vida Guerra, Megan Good, Bill Maher, Chris Reid, Nick Lachey (who was flying solo), My Name is Earl's Nadine Velasquez, Corey Hart, Chris Evans, Tracy Bingham, Claudia Jordan, Nicole Scherzinger, Christina Milian, Travis Barker, Brody Jenner and Frankie Delgado.

(Also in attendance was Marisa Miller - but then again, after the love Maxim showed her a few weeks ago, coming to their shindig is probably the least she could do!)

Seriously - if there'd been any more stars present, there wouldn't be any left to light up the night sky! Check out the video below...

That 70s Show stars Laura Prepon and Wilmer Valderrama reunited on the red (or black) carpet for the Scarlet HD TV party in Hollywood last night.

Too bad the party didn't happen on 4/20, these two might have experienced a real blast from the past!