David Spade and Selena Gomez both voice characters in the new Hotel Transylvania movie (which is the No. 1 movie in the country at the moment, btw)!
They were both on the red carpet for the premiere a while back, where Spade's mom apparently put her foot in her mouth in front of Selena. She ended up yelling "LUPUS!" at the actress.
See Spade explain the awkward encounter to Jimmy Fallon below:
video via Youtube
photos via Getty