What happened to Scott Disick? Sofia Richie has been making headlines with her shocking relationship with Kourtney Kardashian‘s ex ever since the pair stepped out as a couple, especially because Sofia is only 19 and Scott is a 34-year-old father-of-three. But it looks like their May-December relationship really only lasted from May to December because it might already be over — just one day after Scott was photographed at his son Mason’s birthday party with Kourtney, Sofia was spotted out with a mystery man.

Sofia —who is the youngest child of singer Lionel Richie — went for a totally casual look for her lunch outing on Dec. 16, pairing a black cropped sweater with jeans and a pair of black boots. She was seen laughing and enjoying herself with her mystery guy as they dined at Joan’s On Third in LA.

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(Photo Credit: Splash)

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Her outing comes just one day after Scott was photographed arriving at his son Mason’s eighth birthday party on Dec. 15, which was also attended by his ex-girlfriend and baby mama. Scott shares three kids with Kourtney — Mason, five-year-old daughter Penelope, and three-year-old son Reign — and even though he’s been spending a lot of time with his new girlfriend, it seems like his kids are definitely his priority.

Even though it’s clear that Scott’s kids come first, that doesn’t necessarily mean that there’s trouble in paradise for him and Sofia. Things seem to still be going strong between the couple, and they were spotted out together earlier this week as Sofia brought her boyfriend home to meet her mom, Diane Alexander. No word yet on how Diane feels about her daughter’s relationship with a much older man, but one thing is for sure — Sofia’s dad is not happy.

Last month, Lionel exclusively revealed to Life & Style that he was actually “scared to death” about Sofia dating Scott. “I’m scared to death about anybody dating anybody,” Lionel joked and hinted that their relationship might not last. “C’mon, she’s 19. She’s going to go take the turn and get through it and come out the other side…It will course itself.”