It was revealed on Thursday that Robert Pattinson is not dating model Dylan Penn but his new personal trainer Sydney Liebes.

A friend of the petite brunette confirmed that she has been training him to prepare him for his upcoming film shoot for Mission Blacklist.

A friend of Liebes told X17Online : "I talked to Sydney and she's excited about training Rob. She said, 'He's a really cool guy; we're spending a lot of time together in the gym almost every day. He's fun to work with.'"

X17 Online reports that Liebes is from Westlake Village, graduated from high school in 2008 and works at A-list celebrity trainer Harley Pasternak's private gym studio. According to her Instagram, she just graduated from college, so she is new to the fitness industry.

Liebes' friend admits that it's surprising that Pattinson would work with someone who does not have a lot of personal fitness training experience.

"Sydney just started working as a trainer this summer, so I'm surprised she got this gig," said the source. "I don't know why Rob would hire her, when she has so little experience, other than because she's cute."

Robert Pattinson With Mystery Brunette PHOTOS, Leave Gym Together Days After Party PDA Spotting

View the photo gallery above of Robert Pattinson's rumored new girlfriend Sydney Liebes.

Pattinson and Liebes were photographed leaving a gym at the same time but separately on Monday. The pair drove off in the same car together, according to an eyewitness.

"Rob rarely hangs out with a girl he's not dating. He keeps to himself. So they fact they left in the car together definitely means something," the onlooker told X17Online.

He was reportedly seen displaying public affection with a mystery brunette over the weekend. Pattinson held hands with an unidentified woman at a birthday party for actress Shoshana Bush in Los Angeles.

"Rob and the brunette turned up around midnight. They were cute together," an onlooker told RadarOnline. "At one point, he was talking to someone and she wandered over and grabbed his hand and pulled him to over to near the pool. Their hands were all over each other!"

Life & Style Weekly reported Wednesday that Pattinson was dating Dylan Penn, daughter of actors Sean Penn and Robin Wright in early September. The model was seen being affectionate with the British actor in public and at a private gathering in his home.

An eyewitness saw the pair at Los Angeles' nightclub Viper Room on Sept. 7. The onlooker said they were "touchy-feely and very flirtatious," gave away several hints indicating that they have been dating for some time now. They were so comfortable with each other that it was obvious it wasn't their first date.

"There was a level of comfort there," said the eyewitness. "You could tell they've hung out a few times."

Their date didn't end there -- Pattinson later took Dylan to Chateau Marmont for drinks and French fries, added the insider. He had a carwaiting for them to go club-hopping afterwards.

Another source told the publication they and a group of friends spent time at Pattinson's home in a previous occasion.

"They went into his kitchen, and he put his arms around her. Then he was kissing her neck and talking all lovey-dovey. It was clear they'd been out together before." When fellow guests left at 5 a.m., Dylan was still there," said the second eyewitness.

Pattinson reportedly ended his four-year relationship with Kristin Stewart in mid-May following his 27th birthday.

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