Actress/recording artist Jennifer Lopez (L) and Sean Combs attend Jennifer Lopez's 2015 American Music Awards After Party on November 22, 2015 in Los Angeles, California.

Actress/recording artist Jennifer Lopez (L) and Sean Combs attend Jennifer Lopez’s 2015 American Music Awards After Party on November 22, 2015 in Los Angeles, California.

*Something in the water at Sunday’s American Music Awards had old (and not-so-old) flames partying together after the ceremony.

Sean Diddy Combs was spotted with his former girlfriend and “AMA” host Jennifer Lopez at her private afterparty at the Hyde Sunset Kitchen + Cocktails in West Hollywood. They were photographed laughing together and seemingly having a good time.

J. Lo’s on-off relationship with Casper Smart was apparently very “on” at the party. Spies say they “couldn’t keep their hands off each other.”

Meanwhile, at Justin Bieber’s afterparty at The Nice Guy in West Hollywood, Kylie Jenner and Tyga appeared to be back together again after reportedly breaking up last week.

Paps caught them holding hands while entering the party.

Watch below: