Penn Badgley completely made a Gossip Girl fan’s day with a birthday message like no other. In a video shared on TikTok, the actor, who portrayed Dan Humphrey on the CW series, sent a birthday message to the fan — and added something extra at the end.“Happy birthday Serena,” Badgley, 34, said before adding, “XOXO.” He also gasped at the end, knowing how exciting the fan would be when he said Gossip Girl’s famous sign off.WAITED MY WHOLE LIFE TO HEAR HIM CALL ME BY MY NAME.