Pairing up for a sister-in-law filming session, Heidi and Stephanie Pratt were out shooting a segment of MTV's "The Hills" on Thursday (July 9).

With both ladies dressed up in cute little outfits, the Pratt girls visited the SBE headquarters on Beverly Blvd. - with Heidi speeding away in her Porsche Cayenne GTS upon finishing up.

And while she happened to be covered up on this particular day, Heidi is feeling good about her figure following her intense workout regimen, with her trainer telling, “When she came to me her butt was really flat and she wanted to make it bigger. Now, it’s nice, shapely and round."

“She loves showing off her body now, told Waterbury. “She called me from her Playboy shoot and was so excited. The photographers were raving about her.”

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Enjoy the pictures of Heidi and Stephanie Pratt out working on "The Hills" (July 9).