The mags say Aggie's got a baby on the way with new fiancé, Matt Rutter, who just proposed to the pop diva this past Valentine's Day.
Adding weight to the reports, Rutter's mother spilled the beans to In Touch earlier today -- despite being warned not to say anything to the tabloids!
“[I've] been sort of told not to say anything," she laughed. "I don’t know what their plans are. But when you have a baby, you’re not planning on moving anywhere anytime soon!”
It'll be the newly-engaged couple's first child together, and second overall for Christina. She shares custody with her first son, six-year-old Max, with ex-husband Jordan Bratman.