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Jennifer Aniston,  Justin Theroux

Matt Sayles/Invision for DETAILS/AP Images

Jennifer Aniston came out for her main man last night.

The Horrible Bosses star, 45, joined fiancé Justin Theroux, 42, at a dinner in his honor at the Sunset Tower Hotel in Los Angeles.

Theroux was toasted by Details magazine for being their August cover star.

Aniston looked chick in a Balmain jacket and Rick Owens tank. The actress was overheard gushing about her love to fellow dinner guests, calling the actor "kind, graceful and so handsome," according to a source.

Her BFF Courteney Cox was also at the party with her fiancé, Snow Patrol's Johnny McDaid. "They were being super affectionate and everyone was admiring Courtney's engagement ring," a source told me. Theroux held court at his table with Aniston on one side of him and Chelsea Handler on the other. Cox and McDaid sat across from them.

Rumored couple Malin Åkerman and Colin Egglesfield also attended the event.

Jennifer Aniston, Courteney Cox

Matt Sayles/Invision for DETAILS/AP Images

Theroux opened up to the magazine about the public attention on him since he and his wife-to-be started dating.

"It doesn't feel like a hardship, it doesn't feel difficult," the star of HBO's new The Leftovers said. "It can be an annoyance, but it's not the end of the world. You have to center on what its core thing is, which is that you met someone you fell in love with. It's hard to explain. I just find myself wondering, 'What's the big f---ing deal?'"

The two were introduced in 2007 by Robert Downey Jr. "He and Jen fell in a real, legit fashion," Downey said, "and he was willing from the jump to make sacrifices."

Justin Theroux, Courteney Cox, Johnny McDaid

Matt Sayles/Invision for DETAILS/AP Images

PHOTOS: Jennifer and Justin's romance rewind