Melanie Oudin and Jack Sock posed with their mixed doubles trophy in front of the Unisphere.
In the first semifinal on Saturday evening, Sam Stosur ended Angelique Kerber's run, 63 26 62.
Cyndi Lauper opened the night session on Arthur Ashe Stadium ahead of the second semifinal.
Venus Williams was in the stands, supporting sister Serena Williams in the second semifinal.
Serena Williams fired 34 winners to defeat No.1 player in the world Caroline Wozniacki, 62 64.
Serena Williams improved to 12-11 lifetime against reigning No.1s, and 6-5 in Grand Slams.
In the first match of Sunday's card, Vania King and Yaroslava Shvedova played the doubles final.
Liezel Huber and Lisa Raymond were a wall in the doubles final, rallying from 64 53 down.
Liezel Huber and Lisa Raymond celebrated after pulling off a 46 76(5) 76(3) comeback victory.
Liezel Huber and Lisa Raymond joined forces in April. It was their first Slam title together.
By virtue of the US Open victory, Liezel Huber secured a return to the No.1 doubles ranking.
Serena Williams and Samantha Stosur took Arthur Ashe Stadium later on for the singles final.
Ciara, Will Ferrell and Andy Samberg were among the celebs in the crowd for the singles final.
Samantha Stosur's forehand was the most dangerous shot of the final, producing 12 winners.
Sam Stosur fired forehand winners on the last two points of the match to beat Serena Williams.
Sam Stosur rejoiced after completing a 62 63 victory for her first Grand Slam singles title.
After the championship victory, Samantha Stosur was lifted up to her player box to celebrate.
Serena Williams congratulated Sam Stosur at their changeover chairs before the trophy ceremony.
Sam Stosur is only the fourth player to beat Serena Williams multiple times at Grand Slams.
Venus Williams, Jennifer Capriati and Justine Henin are the other three to achieve the feat.