Kristen Bell and Dax Shepard are going to be new parents for a second time, it has been announced. The film stars have confirmed that they are expecting a baby and a sibling for their 15 month-old daughter, Lincoln Bell.

Bell, 33, and Shepard, 39, are taking the next step to expand their young family after Lincoln's birth in March 2013 and their marriage in October last year. "I can confirm that Kristen and Dax are expecting their second child and a sibling for Lincoln. The whole family is beyond excited," a rep for the family told Entertainment Tonight.

Only days before the couple's big news broke, the Frozen actress had joked about adding a new member to the family on Twitter but posted a picture of their new dog. "The newest member of our family comes in the form of this little black man," Kristen tweeted, along with a photo of the fluffy black dog that the couple recently adopted.

More: Kristen Bell says being a mother is "more rewarding than exhausting."

Hollywood Life has speculated that, especially if baby number two is a girl, Kristen and Dax may decide to name them after a character from the smash-hit Disney musical Frozen in which Kristen voiced the lead character, Princess Anna.

The pair married last Autumn after having dated for six years and having been engaged for six. They picked a simple courthouse ceremony in Beverly Hills with just a photographer present to document the union.

More: Dax Shepard has a portrait of Brad Pitt in the bedroom.

The couple had attended the courthouse to obtain a marriage license but decided to wed there and then after an employee informed them that they didn't have to wait. They had both campaigned hard for the legalisation of gay marriage and ruled that they wouldn't tie the knot until gay people were allowed to.

Dax Shepard Kristen Bell
Kristen Bell & Dax Shepard Have Confirmed That They Are Expecting A Second Child.