The royal wedding festivities didn't end with this morning's ceremony! Kate Middleton and Prince William thanked guests at their Buckingham Palace lunch this afternoon as a team of bakers put the finishing touches on their gorgeous wedding cake, then retreated to Prince Charles' residence Clarence House. Kate, William, Charles, and Camilla left the home together later and headed back to the palace for tonight's festivities. Kate exited in a second Alexander McQueen gown, a strapless, diamante-studded dress that she paired with a white angora shrug. William also swapped his garb, trading his military regalia for a tuxedo ahead of the 300-person private dinner his father is hosting. Meanwhile, Kate's parents headed up a soiree for friends and family who were not invited to the palace's intimate meal at The Goring Hotel, where they've been staying this week. The evening is clearly a very formal affair, but the newlyweds' younger siblings, Prince Harry and Pippa Middleton, made sure to inject it with a youthful vibe. The duo organized music and dancing and also promised guests who stay into the wee hours bacon sandwiches and other snacks. Click through to see all the pictures from the royal wedding party's fun-filled afternoon and evening!