Rihanna and Chris Brown's friendship seems to be heating up.
The 24-year-old singer shared an intimate photo of the twosome on Instagram Thursday to her followers.
PHOTOS: Chris Brown and Rihanna through the years
"I don't wanna leave! Killed it tonight baby!" Rihanna wrote as the caption. In the sexy snapshot, the Unapologetic singer straddles Brown, 23, while giving him a bear hug. Though both their faces were hidden from the camera, Rihanna...