It looks like Jennifer Lopez is having a hard time letting go - to the past, that is. There is new speculation that the singer and actress might be dating her ex-boyfriend Casper Smart again, despite the fact that she broke up with him last summer.

According to TMZ on Friday, the ex-couple was spotted out and about in Los Angeles. Smart was at the Z Zegna & GQ event in Hollywood, where he hung out with Nick Jonas. Sources say that Lopez was quietly waiting in a car outside of the event for him, while trying to keep things on the down low.

Eyewitnesses further say that Lopez and Smart then went to Hotel Café in Hollywood, where they were caught by the paparazzi.

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While Lopez hasn't made any comments about the speculation, she did say last month that she's not dating anyone right now.

According to People Magazine on Jan. 22, Lopez said that she wants to stay single for awhile, after having dated non-stop in back-to-back relationships for the past decade. She broke up with Smart back in June after a three-year relationship and was previously married to Marc Anthony before calling it quits in 2011.

She said, "I had to make a commitment to myself to be alone: no flirting. No possibility of anything. No boys in any way, shape of form. I said, 'I'm shutting it down.' I'd never been alone."

Lopez added, "I always found my comfort in another person. Instead of giving myself time to heal and be on my own, I was so afraid to be that I was always like, 'Okay somebody else just come in here and help me forget I'm in so much pain.'"

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Jennifer Lopez