Serena Williams during the Women's Singles Tennis match on Day 8 of the London Olympics. Credit: Clive Brunskill/Getty Images

Sensational Serena!

Serena Williams won her first singles gold medal at the London Olympics on Saturday after defeating Maria Sharapova -- and instantly celebrating by screaming and dancing (or "crip walking") on the court.

With the victory, the 30-year-old tennis superstar made even more history in her sport -- becoming only the second woman to achieve a Golden Slam, winning all four tennis Grand Slam titles (the Australian, French and U.S. Opens plus Wimbledon) and an Olympic gold medal; she's also the very first player to nab a Golden Slam in both singles and doubles.

Astoundingly, Steffi Graf won four Slam singles tournaments -- and a singles gold medal -- back in 1988, all in one year.