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Michelle Obama, Barack Obama, Bill Rancic, Giuliana Rancic

JEWEL SAMAD/AFP/Getty Images; Jeff Kravitz/FilmMagic

Giuliana and Bill Rancic may want to open their next restaurant in Washington, D.C.

Why?

Because Michelle Obama is loving RPM Italian, their Chicago hot spot with Lettuce Entertain You.

The first lady and a pal enjoyed dinner there last night. Diners erupted in applause when Obama entered through the front door. She waved as they were escorted to a private dining room.

They spent an hour and a half at the eatery and left after thanking chef Doug Psaltis.

And, no surprise, everyone applauded again when she took off.

"It was a tremendous honor to have the first lady dine at RPM Italian in Chicago," Giuliana and Bill told E! News. "We were so thrilled when we heard she was coming to our restaurant and hope she enjoyed her meal."

Other celebs seen out and about were...

Khloé Kardashian-Odom and her pal Malika Haqq having dinner at Casa Vega in L.A.

Snooki taking a Spin Cycle class in West Hollywood.

Carrie Underwood checking into the Coeur d'Alene Resort in northern Idaho before her concert in Spokane, Wash.

Sharon Stone enjoying a light lunch at the members-only club Soho House in West Hollywood.