Drew Barrymore is wrapping up her summer of love with the Apple computer commercials’ “Mac Guy,” Justin Long.

The He’s Just Not that Into You costars seemed really into one another over Labor Day in Vegas, where the two were “all over each other, making out the entire time,” a witness at Jet Nightclub tells PEOPLE.

First spotted together at Chateau Marmont on Aug. 28, Barrymore, 32, and Long, 29, brought their holiday weekend to a close back in Los Angeles at a trendy sushi restaurant with friends.

According to a Barrymore pal, “the relationship is very new.”

So new, in fact, the actress dallied with Scrubs star Zach Braff in June and rekindled old flame Spike Jonze in August.

At the end of August, a pal of the actress told PEOPLE, “Drew is crazy about [Jonze]. She’s definitely feeling long-term about it. They’re really great together.”

Reps for both Barrymore and Long had no comment.

Source: People

He’s Just Not that Into You star Justin Long certainly is into his costar Drew Barrymore: He made out with her three times in one week!

After the new loves were spotted cuddling at a party in L.A. August 25 and kissing three days later during dinner with pals at L.A.’s Pace August 28, the actress, 32, and the actor, 29, partied with Barrymore’s bud Cameron Diaz in Las Vegas on September 2.

While at the city’s club Jet, the duo danced a little and smooched a lot: “It was hot and heavy,” says an onlooker of the pair, who canoodled at a corner table until 4 a.m. “They were all over each other!”

Source: US Magazine

Jennifer Aniston and Drew Barrymore enjoyed a girls’ night out together over dinner at the celebrity favorite Tower Bar restaurant at L.A.’s chic Sunset Tower Hotel on Friday, Aug. 31 — Jen has been spotted there in the past with former flame Paul Sculfor.

The two friends were discussing their upcoming film project, He’s Just Not That Into You, the movie they’re shooting this month with Scarlett Johansson, Justin Long, Bradley Cooper, Jennifer Connelly and possibly Ben Affleck. Drew is also starring and producing the film. This is Jen’s first movie since her self-imposed hiatus after splitting with Break-Up co-star Vince Vaughn.

They sat at a corner table after arriving at 8:30 and left separately two hours later. Jen was wearing a white cap-sleeved top — she’s never looked better. Drew wore a dress. They drank sparkling mineral water and a little white wine, and split side order of truffle fries.

“There was lots of laughing and animated discussion,” an eyewitness tells OK!

Source: OK!