US First Lady Michelle Obama and one of her two daughters will take a summer break in Spain, a White House source said Monday.

Mother and daughter would come to the southern holiday resort of Marbella on a "private visit in the company of old friends," the source told the German Press Agency dpa.

US President Barack Obama will not accompany his wife, the source said.

Spanish media reports said Michelle Obama and her younger daughter Sasha, 9, would be on Spain's Costa del Sol between August 4 and 8.

There had been speculation that Barack Obama might also come to Spain to celebrate his 49th birthday on August 4.

Remember this when you go to the polls in November and when you file that tax return, will ya?

Michelle Obama has reserved about 30 rooms for herself and her daughter, their friends and bodyguards at a five-star hotel in Benahavis near Marbella, hotel sources said.

The US first lady did not make any special requests, hotel owner Ricardo Arranz said, explaining that the hotel would function normally during her stay.