A native of London, Ontario, Hedger grew up in Lambeth and Westminster, Ontario and later graduated from the University of Western Ontario. She has one brother who currently resides in London, Ontario.

Jennifer's first on-air experiences were with the London station for Rogers Television where she regularly contributed to the show Plugged In! and was host of OHL Primetime during the 1998-99 OHL season. In 2001, she was chosen to be a part of U8TV: The Lofters, a Canadian reality show where eight strangers lived together in a Toronto loft while also producing and hosting their own online television shows. After her year in the loft ended, she made appearances on TSN's talk show Off the Record with Michael Landsberg, before joining TSN in 2002 as co-anchor of SportsCentre's 11pm and 2am ET broadcasts.

In addition to her TSN duties, Hedger had cameo roles in the pilot episode of the TV series Whistler and an episode of Corner Gas, both of which aired on TSN's sister network CTV.

Hedger dated the former captain of the Canadian national soccer team, Jason de Vos, and she is now married to rival Rogers Sportsnet anchor Sean McCormick.

In November 2007, Hedger was selected in Hello! magazine's Top 10 of the most beautiful women on television.