A boob job for her beau!

Teen Mom 2 star Jenelle Evans had one major motivation to get breast implants earlier this month: On-again, off again boyfriend Gary Head.

"He egged her on," a source tells Us Weekly of Head, 22. "He said she should do it because it would make her happy."

Learn more about the 20-year-old single mom's shocking decision to go from a B to a "full C" for the sake of her man in this week's Hot Stuff video, as told by Us Senior Editor Ian Drew plus special guest, pop singer Meital.

Also in the roundup? Christina Aguilera and Adam Levine's shocking feud on The Voice; Kanye West's "white dress" rap that may be about Kim Kardashian, and how Beyonce is prepping for her post-baby concert comeback.

Watch the video now!