Happy Birthday, Mr. President: Obama turns 52

 Instead of "Hail to the Chief," President Barack Obama is most likely hearing strains of "Happy Birthday" this weekend.

Obama turns 52 on Sunday and is spending part of the day at the Camp David presidential retreat in Maryland.

The White House said little about how he's celebrating. He played golf Saturday with friends from his days in Hawaii and Chicago. Some of them joined him at Camp David.

Obama is scheduled to return to the White House on Sunday afternoon. His week ahead includes travel to the West Coast to discuss plans to help homeowners, appear on "The Tonight Show" with Jay Leno and visit with troops at Camp Pendleton.

He also has a White House meeting Thursday with the prime minister of Greece.

His wife Michelle Obama took to Twitter to send him an affectionate message saying Happy Birthday Barack! Your hair's a little grayer but I love you more than ever! The tweet was accompanied by a black and white photograph of the Obamas as a young couple.