Tina Fey strips down to her Spanx for David Letterman

And as a parting gift, Tina Fey gave him her dress and showed off her "contraptions" to the entire audience! The 30 Rock alum made her final appearance on The Late Show Thursday night, marking her over 20th appearance 

Plus, Reese Witherspoon launches Draper James, another fashion week joins the fray and more from the week in style.

VIDEO: Tina Fey made her last appearance on the “Late Show With David Letterman” memorable by stripping off her blue dress and actually giving it to him. WATCH.

Tina Fey strips off fancy dress for David Letterman's retirement. Comedian appears on 'Late Show' in flattering blue dress. Then, she takes it off and appears in Spanx. 'Bye Dave' is written on the material.

Tina Fey literally gave David Letterman the dress off her back as she promises to never wear fancy dresses again on talk shows following his departure.