Photos of Nick Jonas, Kevin Jonas, Joe Jonas at an Engagement Party for Kevin Jonas and Danielle Deleasa

The Jonas Brothers had more than just America to celebrate this weekend, and the boys kicked things off with an engagement party for Kevin on Friday night. Kevin couldn't hide his grin as he led his new fiance Danielle Deleasa by the hand out of a pizza parlor in LA. On Sunday the boys were back to work, playing their hearts out on stage at a show in Canada. Kevin's life is about to get even more hectic with a wedding to plan, but now he's got a permanent number-one fan in the audience.