Heidi and Spencer: Big Smiles in The Hills

Why are Heidi Montag and Spencer Pratt so happy?

Could it because they're in love? Famous for no reason? Raking in millions by milking the celebrity gossip game for all its worth?

Yes, yes and yes, you can bet on it.

More specifically, though, they're psyched for the launch of Heidi Montag's new clothing line, Heidiwood at Kitson, the same L.A. boutique that just dropped the fashion brand of their arch-enemy Lauren Conrad.

For this reason and others, The Hills' Spencer and Heidi are all smiles.