Kylie Jenner Happy Birthday Tyga ... Here's Your Presents!!

11/19/2016 2:16 PM PST

Kylie Jenner Wishes Tyga A Happy Birthday

Kylie Jenner wished bf Tyga a VERY happy birthday ... and she wanted to let everybody know exactly what she gave him.

Jenner posted the NSFW pic Saturday -- T's 27th bday -- with a, "happy birthday baby." 

The two are in Vegas to celebrate ... but we can't imagine the whole being 19 in Sin City thing is much fun for Kylie.