Article continues below advertisementJenna Jameson is showing off her curves in a plunging backless dress. "Always purposeful," Jameson, 51, captioned a carousel of photos via Instagram on Tuesday, November 18.Article continues below advertisementJenna Jameson Showed Off Her BacksideSource: @jennacantlose/Instagram; MEGAJenna Jameson posed in a hot pink backless gown.In the photo, the former adult film actress (real name Jenna Marie Massoli) posed in front of a vintage store decked out for Christmas, wearing a hot pink backless maxi gown that highlighted her backside and full tattoo sleeve.