Anna Sergeyevna Kournikova is a Russian professional tennis player. Kournikova's professional tennis career has been curtailed for the past several years, and possibly ended, by serious back and spinal problems. She currently is the new trainer, replacing Jillian Michaels, on the television show The Biggest Loser.

Kournikova started dating pop star Enrique Iglesias in late 2001 when she appeared in his video, "Escape." Kournikova herself has consistently refused to directly confirm or deny the status of her personal relationships. In an interview with Graham Norton in 2010, Kournikova confirmed that she and Iglesias have been together for over eight years but have no plans to marry in the near future.

Tennis player Anna Kournikova
Tennis player Anna Kournikova gets a kiss from recording artist Enrique Iglesias as they sit in the crowd to watch the New Jersey Nets play the Miami Heat during game one of their second round of their NBA basketball playoff series in Miami May 8, 2006. REUTERS/Marc Serota
Singer Enrique Iglesias L and tennis star Anna Kournikova of Russia
Singer Enrique Iglesias (L) and tennis star Anna Kournikova of Russia watch as the Dallas Mavericks meets the Miami Heat during Game 3 of their NBA Finals basketball game in Miami June 13, 2006. REUTERS/Lucy Nicholson
Anna Kournikova
Tennis celebrity Anna Kournikova waits to play at the 12th annual World Team Tennis Smash Hits, an annual tennis event benefiting the Elton John AIDS Foundation, in Irvine, California, October 11, 2004. REUTERS/Lucy Nicholson LN
Anna Kournikova
Former professional tennis player Anna Kournikova arrives at the BAFTA Brits to Watch event in Los Angeles, California July 9, 2011. Britain's Prince William and his wife Catherine, Duchess of Cambridge, who are on a royal visit to California from July 8 to July 10, will attend the event. REUTERS/Fred Prouser
Anna Kournikova
Tennis player Anna Kournikova poses on the runway GM ten, General Motors' annual fashion show, in Los Angeles, February 28, 2006. REUTERS/Chris Pizzello
Anna Kournikova
Russian tennis star Anna Kournikova (R) sprays champagne over Spanish tennis player Arancha Sanchez Vicario after their exhibition match in Leon, Spain December 7, 2003. Sanchez Vicario won the match 3-6 6-4 5-7. REUTERS/Victor Fraile VF/GB
Anna Kournikova
Tennis player Anna Kournikova picks up a phone on the floor of the New York Stock Exchange March 25, 2009. REUTERS/Eric Thayer