Balck Eyed Peas' singer Fergie and her husband Josh Duhamel announced on Twitter Feb. 18 that they are expecting a baby this year.

"Josh & Me & BABY makes three!!! #mylovelybabybump," she wrote along with a picture of her and Duhamel as toddlers holding a cat.

Fergie and Duhamel are part of a growing list of celebrities scheduled to give birth in 2013.

Enstars has compiled a list of the top celebrity baby bumps to watch this year. The stars are famous for their backgrounds in music (Fergie, Jessica Simpson), television (Kim Kardashian), film (Penelope Cruz), and for being a part of a royal family (Kate Middleton.)

Reality star Kim Kardashian and Kate Middleton have both revealed that their babies will be born in July. The news of their pregnancy were also announced in December.

Kardashian had only been dating West since April but the Watch The Throne rapper was so excited he slipped the news, without warning Kardashian, while performing in Atlantic City. "Stop the music. Make way for my baby mama," West said about the Armenian beauty who was sitting in the audience.

Later, her sister Kourtney tweeted that she was "overwhelmed by excitement" while Khloe's husband Lamar Odom tweeted that he was "so happy for my Kanye and my sister."

Middleton's pregnancy was announced on Dec. 3 in a statement. "Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting a baby."

Jessica Simpson's second pregnancy was one of the biggest surprises of 2102. She announced that she was with child again on Christmas Day, seven months after she had given birth to her daughter Maxwell. Simpson's best friend Cacee Cobb revealed that she is also expecting. Cobb is married to Scrubs actor Donald Faison.

Former Playboy model Holly Madison shared the news of her pregnancy last August. The ex-fiance of Hugh Hefner tweeted, "I've always wanted to be a mom!" Holly and her boyfriend Pasquale Rotella are expecting a girl sometime this spring.

Model Amber Rose is due any day and has shut down communicating on social media as she readies herself for the baby boy she is expected to have with her fiance, rapper Wiz Khalifah.

View the slideshow of the other celebrities that will give birth in 2013 including Penelope Cruz, her sister Monica Cruz, and Jenna Dawan Tatum who is married to Magic Mike and Vow star Channing Tatum.  House of Lies and Gossip Girl actress Kristen Bell and fiance Dax Shepard are also expecting, along with Vampire Diaries star Evan Rachel Wood, Cougar Town's Busy Philipps and The Real Housewives Of Atlanta's Phaedra Parks.