Aside from birthday antics we hear the couple may have an extra cause for celebration, because a source close to Nick and Mariah has recently revealed that the pair are trying for a baby:

“They’ve been trying during their travels, and she has seen her ob-gyn several times recently in California - and not just for check-ups.”

That’s weird, because in the past Mariah has always sworn she would NEVER have a baby. And besides, we couldn’t imagine a preggers Mariah squeezing herself into one of those infamous denim/leather skin-tight outfits of hers. That would be plain wrong…