Kourtney Kardashian Celebrate Her Birthday In Sin City With WHOM ? SURPRISE

Kourtney Kardashian celebrated her bday at 1OAK Los Vegas Saturday night, nary a Kardashian sibling in sight.

Instead it was a date night as she and baby daddy Scott Disick spent the evening ringing in Kourtney’s 36th year with all the trimmings: confetti, bottles with sparklers, a four-tier cake and giant cutouts of Koutney and Scott’s heads. “They look like they were having fun together,” say our spies.

Kourtney was sans siblings or mom, instead she was surrounded by a bevy of beautiful friends who resembled her sisters.

She sipped on champagne while Scott, who just a month or so out of rehab, seemed to enjoy a cocktail, but spies tell us he did not drink all night.

The couple did not pose on carpet together; Kourtney did the carpet alone.

Kardashian sisters showed their love online:

KHLOE with a montage of photos & caption ” Happy birthday to one of the most monotone chicks I’ve ever met…. You inspire me every day. I couldn’t ask for a better big (little) sister”

KIM photo of two & caption you are there to teach me everything as an adult!

MOM KRIS wrapped it up with pic when Kourtney was born saying that’s when she learned what true love really is

No messages from Kylie, Kendall or Rob.