Having a baby seems to be in vogue these days. From the very young to the nearly middle aged, celebrities are popping out kids quicker than the networks are inventing new reality shows. And for some, shotgun weddings also seem to be the "it" thing to do in Hollywood.

Rumors that Ashlee Simpson and Fall Out Boy rocker Pete Wentz were expecting turned out to be false, but 17-year-old Jamie-Lynn Spears is expecting a child with her new fiancée Casey Aldridge.

Jamie-Lynn Spears will be a teenage mom

Reformed party girl Nicole Richie gave birth to daughter Harlow in January; Christina Aguilera had son Max in January; 38-year-old Jennifer Lopez gave birth to twins Max & Emme in February; and 41-year-old Halle Berry had daughter Nahla in March.

New mom Halley Berry

After months of speculation, Nicole Kidman, 40, finally revealed this winter that she was pregnant with Keith Urban's child, and around the same time Gwen Stefani announced she was expecting her second child.

Nicole Kidman denied pregnancy claims for months

Jessica Alba is expecting and is due in June. Angelina Jolie recently confirmed her pregnancy during a conference in Washington, D.C. Tori Spelling is eight months pregnant.

Angelina Jolie is pregnant with baby number two

Most recently, former Full House star Jodie Sweetin gave birth to her first child Zoie over the weekend. Law & Order alum Elisabeth Rohm had a baby girl on April 10.

Elisabeth Rohm is a new mom

So what does having a baby mean to these stars? For someone like Britney Spears, who is photographed more often without her two sons than with them, maybe it's the desire to receive unconditional love. For Halle Berry, it may be priorities have changed from career to family. For Jamie-Lynn Spears? "Oops!...I Did It Again" may be her theme song.

Stars who are threatening to reproduce include Fergie and Paris Hilton. Last September Hilton commented, "I just started working out and it feels great. It gives me so much energy. I want kids next year, so I've got to get my body ready." And Fergie said she wants to start a family after getting married to fiance Josh Duhamel even though she's "nevery really changed a diaper."

Whatever the reason these stars are having children, it's undeniable that the trend isn't ending anytime soon. So don't be surprised if Lindsay Lohan, Mary-Kate Olsen, or Hilary Duff announce they're expecting.

Renee Zellweger recently admitted that "motherhood has never been an ambition." If it happens, it happens. If not, well, she'll be out of fashion.

Story by Noelle Talmon
Starpulse.com contributing writer