Lisa will play herself in the episode, which follows a disgruntled Rob (Daniel Mays) as he tries to find a date to take to his ex-girlfriend's wedding.
Having been unsuccessful in finding one so far Rob decides to try and out-do his ex, who's marrying ex-boyband singer Duncan James (who is also playing himself) by bringing Snowden.
This will be Lisa's second appearance in a comedy show, having starred alongside Love Actually's Andrew Lincoln ten years ago in A man's Best Friend, a 12-minute production about football versus love. The 38 year-old also presents Britain's Next Top Model.
Good luck to Lisa. She was great on Strictly.