Beyonc Knowles "definitely" wants more children after giving birth to her first daughter.

The singer and her husband Jay-Z welcomed Blue Ivy into the world in January.

She is already thinking of expanding her brood.

"I definitely want to have more," she told ET Online.

"I don't know how many. God knows I don't know yet."

The Crazy in Love star showed off her svelte post baby body in a sheer figure-hugging black gown at the Met Gala in New York City on Monday night. However, the 30-year-old insists she hasn't been working out since becoming a mother.

"I haven't had much time in the gym [since the baby was born]," she said.

"I've been rehearsing, I have a show coming up and it's my first show in a year."

The star is thought to almost be back to her pre-pregnancy weight, previously saying breast feeding has helped her drop the pounds.

Beyonc, who was recently named People magazine's most beautiful woman, gushed about her baby daughter. Blue has given her life a new meaning.

"I have such a full life," she explained. "I feel like now I know the reason that I was born."

The stunning star has previously told of her excitement about becoming a parent, saying her daughter is the best gift she has ever received.

"I feel more beautiful than I've ever felt because I've given birth," she told People at the time she was crowned most beautiful. "I have never felt so connected, never felt like I had such a purpose on this earth."