Kelly Rowland, former Destiny's Child's singer, accidentally let it slip Friday that Beyonce Knowles and Jay-Z are expecting a baby girl.

At the Cosmopolitan Ultimate Women of the Year Awards 2011 in London, Rowland told BANG Showbiz that Beyonce is pregnant with a girl, reported MTV.

I have no idea what I'm going to buy Beyonce at the baby shower because Jay is going to buy that little girl every single thing possible. She won't be spoiled but she will be very well looked-after, Rowland, 30, said in an interview with BANG Showbiz.

I'm so happy for my sister and her husband, she continued. They're so happy in this moment right now, as they should be. They've made a little bundle of love; I'm so excited for them.

Neither Jay-Z nor Beyonce have commented on the sex of their baby. Beyonce announced her pregnancy in August at the 2011 MTV Video Music Awards. 

I want you to feel the love that's growing inside of me, the singer told the audience at the MTV VMAs in August as she rubbed her stomach. Still, many rumors have surfaced questioning whether her baby bump is real or fake.

Beyonce, 30, and Jay-Z, 41, married in April 2008 and their first child is due in February, reported the New York Post.