Chelsea, who has a penchant for stripping off and posting nude shots on her social media pages, bared all again to wish her friend a happy birthday with a risque selfie.

The comic wore only black stockings for the sexy snap, which she posted on Instagram on Tuesday (22Mar16).

"Happy Birthday @reesewitherspoon," she captioned the photo.

Chelsea hit headlines with another saucy shot just last week (ends18Mar16), when the 41-year-old posted a photo of her bottom while filming her upcoming Netflix talk show.

Reese celebrated her 40th early over the weekend (19-20Mar16), by hosting a star-studded birthday party in Hollywood.

Guests included Jennifer Aniston, Kate Hudson, Nicole Kidman, and Matthew MCConaughey, while the birthday girl performed with Keith Urban and was stunned by a surprise performance from Taylor Swift.