Pink wants to “get busy on baby number two”.

The singer is determined to conceive a second child with her husband Carey Hart as soon as possible.

The couple are using her current The Truth About Love tour to provide a sibling for their two-year-old daughter Willow Sage.

“Pink and Carey want a sibling for willow, and are using the tour as a chance to ‘get busy’ on baby number two,” a source told America’s OK! magazine.

The family are keeping close as they trot the globe for her 2013 gig dates.

Apparently their little girl is begging for a younger brother or sister.

“Willow has already put in a request for a little sister,” the insider continued. “Pink’s thrilled that Carey and Willow are on tour with her because it makes it feel like a family vacation rather than work.”

The singer is relaxed and happy about the choice to expand the family.

Due to her joyful state, the pair are certain she will get pregnant sooner rather than later.

“She doesn’t get as stressed out when Carey’s around,” the source added. “[Pink and Carey] have secretly taken bets on which city they’ll conceive in.”

Pink recently described her little girl as the "coolest thing" that's ever happened to her.

The 33-year-old star’s tot shows her unconditional love even during her weirdest moments.

"She's the coolest thing that has ever happened to me. Now I have someone to sing goofy ass songs to all day and she likes it," Pink told GQ Australia.

"She's not judging me. She's probably the only person who doesn't judge me."

Having a child was a big step for the star. While Carey always wanted to have kids Pink was admittedly "terrified" of bringing a baby into the world.