Casey's Mom: I'm Going to Be a Grandma!

12/18/2007 10:47 PM PST

Casey's Mom: I'm Going to Be a Grandma!

TMZ spoke exclusively with Joyce Aldridge, mother of Casey, who confirmed that Jamie Lynn Spears is indeed pregnant with her grandchild.

Joyce said, "We are aware of the recent interview regarding her and being pregnant, and we are in agreement with everything that was said by Jamie Lynn about the situation ... everything is fine."

When asked if Casey had anything to say about his girlfriend being preggo, she said, "At this point, Casey doesn't wish to speak out, but it would be wonderful when the time comes." When asked about their ages and any negative aspects, she said, "Casey will address all of this when it is time."

TMZ also spoke with Casey's grandfather, James, who did not know about the pregnancy, but confirmed his grandson is dating Britney's sister, and that his son Mark, Casey's dad, works at a paper mill in Cleveland, TN.