Christina Aguilera is ''aching for another baby.''

The 'Your Body' hitmaker, who has 13-month-old daughter Summer Rain with her fiancé Matt Rutler, has reportedly stopped drinking alcohol and started taking prenatal vitamins because she is so desperate to fall pregnant again.

A source close to the star told the US' OK! magazine: ''[She's] aching for another baby. She didn't have trouble getting pregnant before. So it's only a matter of time before she makes the announcement.''

The 34-year-old singer, who also has Max, seven, with ex-husband Jordan Bratman, is currently planning her wedding with her beau Matt, 30, but is ''prepared to walk down the aisle with a bump'' and has also gained five pounds, as she wants to be as healthy as possible before she conceives.

Christina previously admitted she felt an immediate bond with Summer because she is such a good baby.

She said: ''I have a chill baby, she's just so calm and so easy to make laugh and smile, she's just a breeze, thank God! She's just so beautiful, these big blue eyes, she's just so gorg... [I'm] very happy and feel very blessed having Summer Rain in my life.''