Hollywood's hottest stars know that one the secret of keeping any romance alive is by engaging in splashy displays of public affection, whenever and wherever they can! RadarOnline.com has photos of your favorite celeb couples, getting busy in front of a live audience, and sometimes crossing the line. Click the next sentence to see stars engaging in PDA.

PHOTOS: PDA Alert!  Touchy-Feely Stars Who Are Not Shy Showing Their Love

Paris Hilton has never missed a chance to show off her scandalous bikini body -- or her latest boy toy. The blonde babe most recently got busy with Cy Waits in Maui this holiday season, presenting her hunky beau the gift of her love. See Paris getting busy on the beach with Cy by clicking here.