At Diddy’s 50th birthday celebration at his LA home on Saturday, some exes had unlikely reunions, Jay-Z snatched a phone, and Kate Beckinsale and Post Malone smoked together.

A spy at the swanky bash at the host’s Holmby Hills home noticed some of the former couples: “Khloé [Kardashian] and French Montana were talking in a corner, and so was Kylie [Jenner] and ex Tyga.”

Kim Kardashian and Ray J (her ex and co-star in their infamous sex tape) were also at the party.

Meanwhile, “Kate Beckinsale was smoking cigarettes in the back with Post Malone,” a source told us.

A video surfaced of Jay-Z snatching a phone out of an unidentified man’s hand — with many fans assuming he was trying to prevent the guy from recording his wife Beyoncé, who was busy dancing with her former Destiny’s Child bandmate Kelly Rowland to a tune by Bobby Brown.

Either way, birthday boy Diddy was spotted with Snoop Dogg at a CBD-product bar from former Combs Enterprises president Dia Simms’ BRN Group.