Disney-themed names seem to be the new trend in Hollywood, with Ryan Gosling and Eva Mendes channeling The Hunchback of Notre Dame in naming their baby girl Esmeralda Amada in September, and Girls Next Door star Holly Madison also revealing herself to be a Sleeping Beauty fan by naming her daughter Rainbow Aurora last March.
Bilson and Christensen met while filming 2008's Jumper and got engaged later that year. They called off the engagement in August 2010, then reconciled three months later.
The OC star has made no secret about her desire to start a family, telling Cosmopolitan magazine last April that she definitely had "family on the brain."
"Having kids is something I want to see in my future -- I hope," she said.
"I knew she wanted a baby, she wanted it so badly," her Hart of Dixie co-star Jaime King told Us Weekly in May about Bilson's pregnancy. "She's going to be in such good hands -- she's in a really good space."
"Just seeing her with my son, I know she's going to be the best mother," King gushed.
Rachel Bilson gives birth to a baby girl -- find out her Disney-inspired name!
Rachel Bilson and hubby Hayden Christensen welcomed their baby girl Briar Rose, likely inspired by Disney's classic tale "Sleeping Beauty." Briar Rose is the pseudonym of Princess Aurora. (Photo by Michael Buckner/Getty Images for Torch)
Ryan Gosling and Eva Mendes also opted for a Disney-inspired name -- Esmeralda from "The Hunchback of Notre Dame." (Photo by Sonia Recchia/Getty Images)
Few remember the unusual name of Sean Penn and Robin Wright's only son -- Hopper. (ROBYN BECK/AFP/Getty Images)
Sylvester Stallone went with a very peculiar and admittedly intimidating name for his son with then-wife Sasha Czack -- Sage Moonblood. (Photo by Ron Galella, Ltd./WireImage)
It's not surprising that bohemian queen Nicole Richie went with an equally bohemian name for her son with Joel Madden. The couple welcomed baby Sparrow in 2009. (Photo by Jon Kopaloff/FilmMagic)
Singers Gavin Rossdale and Gwen Stefani have three little boys -- Kingston James McGregor, Zuma Nesta Rock and Apollo Bowie Flynn. Their first son Kingston's name was inspired by the Jamaican city. (Photo by David Becker/Getty Images)
Bob Geldof's daughters with Paula Yates all have extremely unusual names -- Peaches, Pixie and Fifi Trixibelle. The third definitely takes the cake. (Photo By Tom Wargacki/WireImage)
Jamie and Jools Oliver opted for very whimsical names for their three daughters -- Daisy Boo, Petal Blossom Rainbow and Poppy Honey. (Photo by Dave M. Benett/Getty Images)
Rumer, Scout and Tallulah are the three daughters of Demi Moore and Bruce Willis. (Photo by SGranitz/WireImage)
Tea Leoni and David Duchovny have two children together -- Madelaine and Kyd. (Photo by Bennett Raglin/WireImage)