BRUNO MARS IS A PRINCE GROUPIE:

He says, "I love artists like Prince, who hold on to that element of mystery. You don't know where the hell Prince is in this world. He's probably on a unicorn somewhere, you know?"

KELLY CLARKSON DOWNSIZES:

She says, "I lost 18 pounds. And I think that happens when you fall in love or date someone. If I'm going to be messing around, I gotta look good. There's not a fad diet. I was working with a trainer, and she said, 'You'd be amazed the amount of weight you can drop by halving your portions. I know it sounds crazy, but do it for two weeks and watch what happens.' I just cut back my portions, I stopped eating late at night, and I work out a little more than I used to, and I literally dropped 18 pounds in a month. I think it happens when you get really busy. But when I'm on my off-time...girl, those 18 might come back."

JOHN MAYER READY TO PROPOSE TO KATY PERRY??

A source tells Hollywoodlife.com, “John is completely cuckoo for Katy. They are, like, the perfect match for each other. They can talk about music, writing, traveling. They both want to take a trip to Japan together. Katy adores her fans there and John has always enjoyed spending time there. John really likes the fact that Katy is so independent and not needy and clingy like other girls he has dated. This is the first time John has felt so strongly about a girlfriend. It wouldn’t surprise me at all if he proposed to her. Not immediately but eventually. They both really do bring out the best in each other.”