The `Run the World (Girls)` singer arrived at the MTV Video Music Awards (VMAs) last night (28.08.11) in a loose fitting orange dress, and clutched her visible baby bump as she posed on the red carpet.
She told the press: "I have a surprise!"
Beyonce`s publicist later confirmed the news, telling People.com: "I`m happy to say it`s true."
The child will be the first for the 29-year-old and her husband, rapper Jay-Z, who married in 2008.
During the VMAs Beyonce first cheered on Jay from the side of the stage as he performed new single `Otis` with Kanye West, then wowed the Nokia Theatre in Los Angeles herself, singing `Love on Top`.
She told the crowd: "I want you to feel the love that`s growing inside of me."
As she sung, Beyonce proudly rubbed her bump, and the cameras panned over to Jay-Z, who had a huge grin on his face. The performance was met with a standing ovation.
Beyonce has recently hinted she was thinking of settling down, saying earlier this month how she was hoping to "dedicate herself" to having children.
She said: "When you`re young - 18 or 19 - you have the energy and drive. That`s the time to work as hard as you can.
"Now I`m a woman, and because I gave it my all, I can focus on my marriage. I can decide I want to have kids. I can be the mother I want to be and dedicate myself to my children."