Pregnant Jennifer Lopez and hubby Marc Anthony freaked out after hearing news about a mystery package left on their down step, Life & Style reports.

Jennifer Lopez and , Marc Anthony, weren’t home on Dec. 3 when, a scruffy-looking man walked up to the front of their LA mansion. He left a package in the mailbox and walked off. A witness called police, who questioned him, then let him go.

“Marc freaked out,” says a J.Lo family friend. Jennifer, 38, “has been under a great deal of stress lately, making preparations for the baby, and then she realized how easy it was for someone to walk right up to her door.”