Christina Aguilera spent two hours picking out items for her baby registry at the Robertson Boulevard boutique Bel Bambini, US reports.

"She looked beautiful," says store sales employee Crysta Smith about the singer, who wore a long black skirt and a cotton jacket. "She had a little bump. She said she was so excited [to have a baby]."

Aguilera, who has never officially confirmed her pregnancy, told the staff that she was expecting – and revealed the gender of her baby, but asked to keep it private.

"They registered for all the accessories," says Smith. "They were both picking out things together."