Jennifer Aniston's New Man: Justin Theroux

June 3, 2011— -- Famously fickle actress Jennifer Aniston has a new man -- actor and screenwriter Justin Theroux -- and he's a departure from previous beaus.

"He's a little edgier than the guys she's been out with, but they're having a really good time," People magazine reporter Lesley Messer told ABC News Now's "What's the Buzz." "Apparently, she's really happy."

Although they've been dating a few weeks, Aniston threw a small get-together May 27 to introduce Theroux to her best pals. Chelsea Handler and Courteney Cox, putting to bed rumors that she and Cox were on the outs.

There has been "tension" between the former "Friends" co-stars over Cox's separation from husband David Arquette, according to a report in this week's Us Weekly magazine.

Us quoted an insider saying, "Jen thinks Courteney is being callous" by spending time with her "Cougartown" co-stars Brian Van Holt and Josh Hopkins, without formally filing for divorce from Arquette.

Aniston's rep called the report "completely false," telling the Los Angeles Times, "There was no falling out. Jennifer has always and continues to consider Courteney a dear and close friend."

Cox apparently approved of Aniston's new beau.

"They all had a great time and enjoyed Justin's company," a source told People.

Aniston, 42, and Theroux, 39, first became friendly on the set of "Wanderlust" in the fall, according to the magazine. Aniston has been known to fall for her co-stars. Remember Vince Vaughn? Gerard Butler?