Los Angeles, Sep 19 (IANS) Singer Jessica Simpson celebrated her husband Eric Johnsons 38th birthday by posting a buttock-baring photo on her Instagram account. On Sunday night, Simpson, 37, shared a picture of herself with her husband. In the photo, Simpson's husband can be seen double-fisting two pints of foamy beer as she is bent over in front of him, flashing her undergarments to the camera, reports people.com. "38 IS GREAT," Simpson captioned the photo, adding the suggestive hashtag, "#IAMSOHOTFORYOU" This is not the first time Simpson celebrated a birthday by posting such a picture of herself. For her big day this year, Simpson shared an Instagram of herself lounging in a pool with the caption, "kiss my buttock 36." Simpson and Johnson got married in 2014 after dating for nearly four years.