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Kate Upton

INFphoto.com

We bet we can guess why Kate Upton is all smiles while at Paris Fashion Week!

The 21-year-old model, who recently went public with new dance-pro boyfriend Maksim Chmerkovskiy, stepped out in the City of Light today grinning from ear to ear.

Dressed in black boots, dark pants and a colorful plaid sweater, Upton flashed her pearly whites for photogs while heading to lunch. The blond beauty completed her Parisian daytime look with a blue bag and dark sunglasses.

Kate is currently at PFW without her beau.

Last week, Upton stepped out holding hands with Chmerkovskiy, 33, who she's been quietly dating for a few months now. "It's important to them not to exploit their relationship," a source recently told E! News of the couple. "They're very low-key, because they don't want to attract the press. That's not what they're about."

"They go to the gym together a lot," the source added. "Fitness is something they bond over. They also go on a lot of late-night walks. It's romantic and they know that at night there's less of a chance they'll be recognized."

But Upton and Chmerkovskiy are taking it nice and slow. The source dished, "They're not moving in together yet. She's looking for her own place [in NYC]."