Sizzling Chemistry -- Which Celebs Have it?

It's Valentine's Day, kids, and let me say, right off the bat, that I love you. All of you. Even the haters.

That's right, I'm filled with love and you can't stop me. We are so quick to spread hate and venom, but so short on love. Not today -- I'm spreading love. Get on board, tell the people that mean the most to you how you feel. Whether it be your mom, dad, brother, sister, best friend, husband, wife, babysitter, teacher, butcher, hairstylist, mailman -- whoever. Spread the love. Spread it like butter.

Okay, back the world of celeb gossip. Ever wonder what makes certain celeb couples sizzle (hello, Brangelina), while others just completely fizzle out? Well, we did some digging, talked to some professionals, and found out the inside scoop on, let's just say, Jessica Simpson and Tony Romo are scoring touchdowns in the boudoir, while Jess and John Mayer hit a sour note.

Check out Celebrity Chemistry Class now>>

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