Russell Simmons has congratulated Beyonce Knowles on her pregnancy.
Although the 31-year-old singer hasn't confirmed speculation that she and husband Jay-Z are set to welcome a new addition to their family, the hip-hop mogul - who is a close friend of the couple - tweeted his congratulations.
He tweeted: "Congratulations Jay-Z & Beyonce."
Beyonce recently admitted she would love to give her 16-month-old daughter Blue Ivy a sibling, because she enjoyed such a close relationship with her younger sister Solange Knowles, 26, when they were growing up.
She said: "I would like more children. I think my daughter needs some company. I definitely love being a big sister."
When pressed on when she may have another child, she added: "At some point, when it's supposed to happen."
The superstar - who is currently on her 'Mrs. Carter Show World Tour' - also revealed she doesn't use her full range of vocal talents when she sings nursery rhymes to 16-month-old Blue Ivy and saves her "Beyonce voice" for the stage.
She explained: "I do [sing to Blue Ivy] but I have a mommy voice. I keep my Beyonce voice for the stage and I have my simple mommy voice.
"I remember hearing a story about Celine Dion and she was like, 'When I sing, I don't know if it was her son, cried.' And that's so interesting she has the most beautiful voice in the world and she's like, 'He hates it.' So I say well maybe I'll just give a little simple nursery rhyme voice to my daughter."