Scarlett Johansson Moves in With Sean Penn: Which May-December Couple Makes You Say 'Ew'?

Scarlett Johansson and Sean Penn

Scarlett Johansson and Sean Penn

We're not really sure what sure what's more scandalous: The recently divorced Scarlett Johansson moving in with Sean Penn after just three months of dating, or their 24-year age difference.

A source told Us Weekly that ScarJo, 26, "has essentially moved in over the last few weeks," though Johansson has denied pregnancy rumors.

Fifty-year-old Penn, meanwhile, has a daughter and son with ex-wife Robin Wright who are not much younger than Johansson. 

SODAHEAD SLIDESHOW: See the ickiest May-December couples.

But Johansson and Penn are far from the only May-December couple in Hollywood. Demi Moore and ex-husband Bruce Willis both married much younger spouses, and Hugh Hefner is set to marry 24-year-old Crystal Harris in June -- a woman who is SIXTY-ONE years his junior.

From Johansson and Penn to Hefner and Harris, let us know: Which May-December couple makes you say "ew"?