Scott Disick and ‘mystery brunette’ have seriously awkward encounter with Kendall Jenner!

When your sister’s ex walks into the room with his latest squeeze, you’d be forgiven for giving them some serious side eye and downing your drink really quickly. Well, that's what we'd have done if we were Kendall Jenner, who ran into her former brother-in-law Scott Disick and a ‘mystery brunette’ last night.

Since splitting up with Kourtney Kardashian in summer, Scott’s been playing the field and, after leaving rehab, he’s been starting to go back onto the party scene. Yesterday, the self-styled Lord rocked up to Chris Brown’s album listening party with his new girl.

And he bumped right into Kourt’s little sister, Kendall. And it sounded so AWKWARD.

“There is definitely some frigidness between them,” an insider told Perez Hilton. We bet there is.

How happy would you be if you saw your former brother-in-law partying while your sister is home looking after their three children? Especially after Kourtney pleaded with Scott to stop his partying.

Let’s hope next time one of them rings ahead and checks the guest list.