"Here we go again" with celeb-slamming relationship rumors. Demi Lovato took to her Twitter page to deny that she and fellow Disney star and Camp Rock 2 co-star Joe Jonas are an item. "There's been a lot of rumors lately that I'm dating one of my best friends Joe. I can promise my entire career that I am not," Demi tweeted. "We've NEVER dated. He's incredible, but we don't have feelings for each other in that way. I love you guys, and I wouldn't lie about that". Uh oh...could Demi just be pulling a Kristen Stewart by denying the romance? Only time will tell, but we're crossing our fingers that the rumors are true!