Chelsea Handler will give you any excuse to get naked on Instagram. Today, Chelsea decided to get naked for Reese Witherspoon's 40th birthday -- because that's what you do when you are Chelsea Handler.

At this point, the comedy queen has posted so many racy Instagram snaps that she's likely to take it all off because she's simply celebrating the fact that it's Tuesday, or that she found a pair of matching socks or she just wants to show off her new bathmat.

The 41-year-old posted the full-frontal snap with the caption, “Happy Birthday @reesewitherspoon."

If we were Reese instead of a nude Instagram we'd rather just get a card and some flowers!

Over the weekend, the former E! host helped the Legally Blonde star celebrate her 40th birthday with an early bday bash at hot spot Warwick.

We hope she kept her clothes on at the star-studded soiree -- but really there are no guarantees with Chelsea!