What ever happened to sibling loyalty. It seems these days there are no limits even when it comes to exes and current flames.

Kylie Jenner spent time with Scott Disick on Friday night while showing off his diamond encrusted watch on her Snapchat.

The 18-year-old posted snaps with Scott, 32, before her boyfriend, Tyga, hit the stage for his concert at Club Nokia in Los Angeles.

In the clips, the reality starlet wears the watch briefly before the father of three sports his dazzling time piece.

Having some fun: Kylie Jenner spent time with Scott Disick on Friday night while showing off his diamond encrusted watch on her Snapchat

Posing pretty: The 18-year-old posted snaps with Scott before her boyfriend, Tyga, hit the stage for his concert at Club Nokia in Los Angeles

Mommy patrol: Kourtney Kardashian stepped out to lunch with mom Kris Jenner and kids earlier on Friday amidst rumours she is once again seeing Scott

His split with Kourtney, Kylie’s big sister in June, although they still go to weekly therapy sessions together.

The former lovebirds were spotted at 1Oak nightclub in West Hollywood on Tuesday, where they ‘were extremely friendly’ and ‘flirtatious all night,’ according to People Magazine.

The former flames are parents to three children together: six-year-old Mason, three-year-old Penelope and 14-month old Reign.

Well I do not think Kourtney would be amused to see her baby sister’s posts