Yes, that’s Yoda and Darth Vader rocking Christmas hats, but there’s no reason why prequel characters have to show up in this nativity.
Actually, there absolutely is a reason, and it’s that when the dad who set this up first tried to get a Slave Leia to stand in as the Virgin Mary his wife made him sleep on the couch for a week, so he settled for Mace Windu and Ewan McGregor-era Obiwan instead.