Christina Aguilera's mother-in-law-to-be drops baby hints

Newly-engaged Christina Aguilera is preparing to tell the world she's pregnant, according to the singer's future mother-in-law.

Excited Kathleen Rutler let slip a little baby news during a recent interview with In Touch magazine when she was asked point blank if she was about to become a grandmother.

She told the publication, "I've been sort of told not to say anything."

She refused to open up further, but appeared to slip up again when she was asked about her son Matt's wedding plans and where he and Aguilera would call home when they become man and wife.

The New Jersey native said, "I don’t know what their plans are, but when you have a baby, you’re not planning on moving anywhere anytime soon!"

Rutler told the publication that she's thrilled Aguilera said yes to her son's proposal last week (ends14Feb14), adding, "We love Christina."

Sources close to Aguilera tell Us Weekly magazine that the singer is definitely expecting her second child.

She has a six-year-old son, called Max, from her marriage to Jordan Bratman.

The singer has yet to comment on the baby reports.