Bella Thorne: The Proof's In The Smooch ... Tyler Posey's My New Dude

Bella Thorne's got herself a new man, and he's a good friend of her ex ... well, maybe not anymore.

Thorne was caught kissing "Teen Wolf" star Tyler Posey in West Hollywood Friday and it doesn't appear like they're trying to keep it on the DL.

You'll remember ... Bell and longtime bf Gregg Sulkin split last month and just a few weeks after, she posted a video making out with her female best friend.

Tyler's had his run-ins with same sex situations too -- posting a video shouting "I'm Gay!!" -- only to take it back and say it was a show of support for the LGBTQ community.