Ariana Grande rejects Big Sean's kiss on stage...

So much for all that onstage sexual chemistry!

Ariana Grande has never shied away from PDA. Perhaps allowing her boyfriend to kiss her in front of young fans is off limits, or she was just feeling... jittery. The KIIS FM Jingle Ball in Los Angeles kicked off over the weekend and Ari was joined by boyfriend Big Sean for their latest duet 'Best Mistake.'

The couple flirted on stage making for a steamy performance until the very end when Big Sean leaned in to kiss his girlfriend and she turned her head away, rejecting him. Ouch! She had a number of collaborators join her on stage including The Weeknd for 'Love Me Harder' and Jessie J for 'Bang Bang.' Iggy Azalea did not join her for 'Problem,' despite performing her very own set at that same concert. Though, fans were treated to an exclusive when she performed her new Christmas single 'Santa Tell Me,' for the very first time. 









Thoughts?