Two And A Half Men: Season 7, Episode 11

7 - 11: Warning, It's Dirty

With Celeste (Tinashe Kachingwe) away for Christmas, Charlie teaches Jake how to cheat on her, but this backfires when Celeste returns moments before Jake arrives with a girl he picked up on the beach, which also lands Charlie in hot water with Chelsea; Evelyn brings ailing TV personality Marty Pepper (Carl Reiner) to Charlie's Christmas gathering. Title quotation from: Marty Pepper, about how he knows Lucille Ball isn't a natural Redhead.