(Cover) - EN Showbiz - Christina Aguilera wants Pink to join her on play dates once she gives birth.

Christina has two-year-old son Max while Pink is due to give birth next year, and the two singers have conversed about the perils of being mothers on Ryan Seacrests radio show.

Christina congratulated her fellow singer on her pregnancy, before suggesting they meet up once Pink has given birth.

We have to have play dates, Christina said enthusiastically.

Pink laughingly replied: "Ha ha ha, yeah. What if your kid punches my kid, then what happens?

Pink went on to reveal she always knew she would go on to have kids with her now-husband Carey Hart, who she married in 2006. The pair had an instant attraction, and were planning a future together soon after they met.

"Two weeks after I met him," she said. "He actually told me that. We were sitting at - where were we? - Macaroni Grill. We were going super romantic. He was like, 'So, want to have kids?' Yesterday we just celebrated our nine-year anniversary. I went to rehearsals and he went to ride his motorcycle," she gushed. (C) Cover Media