(AP) — President Barack Obama has treated first lady Michelle Obama to a surprise birthday party at a tony Washington restaurant known for its commitment to organically grown food.

Surprising the birthday girl Saturday night at Restaurant Nora in Washington's Dupont Circle neighborhood were her mother Marian Robinson and friends, including Attorney General Eric Holder, White House Adviser Valerie Jarrett and Jocelyn Frye, who is a domestic policy adviser to both the president and first lady.

Mrs. Obama walked into the restaurant in a dark, knee-length frock. President Obama was dressed casually with no tie.

Michelle Obama will turn 46 on Sunday but her husband is expected to be in Massachusetts campaigning for Martha Coakley, who is in a tough fight with Scott Brown to replace the late Sen. Edward Kennedy and retain the Democratic party's 60-vote majority in the U.S. Senate.

She spent part of her last birthday on a train from Philadelphia to Washington, as her husband made his way to the Capitol to be inaugurated.

Restaurant Nora claims to be a pioneering organic restaurant, with 95 percent of its food produced by organic growers since 1999.

From Love Lane in Mattituck, NewsdayTV's Elisa DiStefano and Newsday deputy lifestyle editor Meghan Giannotta have your look at ways to celebrate Valentine's Day this year. Credit: Randee Daddona, Gary Licker; Newsday / A.J. Singh

Put a little love in your heart with the NewsdayTV Valentine's Day Special! From Love Lane in Mattituck, NewsdayTV's Elisa DiStefano and Newsday deputy lifestyle editor Meghan Giannotta have your look at ways to celebrate Valentine's Day this year.

From Love Lane in Mattituck, NewsdayTV's Elisa DiStefano and Newsday deputy lifestyle editor Meghan Giannotta have your look at ways to celebrate Valentine's Day this year. Credit: Randee Daddona, Gary Licker; Newsday / A.J. Singh

Put a little love in your heart with the NewsdayTV Valentine's Day Special! From Love Lane in Mattituck, NewsdayTV's Elisa DiStefano and Newsday deputy lifestyle editor Meghan Giannotta have your look at ways to celebrate Valentine's Day this year.

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