Awkward! Adorable! Hilarious!
In the clip, Mossy attempts to keep a straight face as she reads a salacious passage in a deep, seksi voice for BBC Radio 1, and the money raised to get her to do it will go directly to the Comic Relief charity.
Watch the vid (above) and get ready to crack up with the supermodel as she gets acquainted with Anastasia and Christian!
P.S. She looks so young and pretty! Wow!