In 1980, Eggert, only eight at the time, landed a role in the movie Rich and Famous, opposite Jacqueline Bisset and Candice Bergen. Eggert appeared on the television show Charles in Charge when it was syndicated for three years between 1987 to 1990. After the show was canceled, she was featured as one of the many lifeguards on seasons 3 and 4 on another syndicated show, Baywatch, at the time of its height of popularity. She appeared on the show from 1992 to 1994.

In 1991, Eggert began a serious relationship with Blown Away co-star Corey Haim. The pair had previously dated during the '80s. During the filming of Blown Away, Haim proposed to Eggert and she accepted, however their relationship ended 5 months later allegedly due to Haim's ongoing battle with drugs. Eggert appeared on the cover of Sugar Ray's 1995 debut album Lemonade and Brownies.

In 2004, Eggert played the role of "Ginger" in the first edition of the TBS network's The Real Gilligan's Island reality show. She was the first guest star to appear on The Super Mario Bros. Super Show!. Also in 1989, Eggert hosted the Nickelodeon Kids' Choice Awards with Wil Wheaton. She also appeared on Scott Baio Is 45...and Single (featuring her Charles in Charge co-star) in 2007.

• Phantom Racer (2009) (TV) (post-production) .... Tammy
  
• A Christmas Proposal (2008) .... Lisa
• Loaded (2008) .... Allison Ryan
• Past Lies (2008) (TV) .... Kim
• Holiday Switch (2007) (TV) .... Paula Ferguson
• Lightspeed (2006) (TV) .... Beth
  ... aka Stan Lee's Lightspeed (USA: complete title)
• Cattle Call (2006) .... Laurel Canyon
  ... aka National Lampoon's Cattle Call (USA: complete title)
• Dead Lenny (2006) .... Sally Long
• Snowman's Pass (2004) .... Diana Pennington
  ... aka What Lies Above (USA)
• Decoys (2004) .... Detective Amanda Watts
  ... aka Piégés (Canada: French title)
• Devil Winds (2003) (TV) .... Julia Merrow
• Wall of Secrets (2003) (TV) .... Paige Emerson
  ... aka Mur des secrets, Le (Canada: French title)
• Baywatch: Hawaiian Wedding (2003) (TV) .... Summer Quinn
• "Gilmore Girls" .... Aubrey (1 episode, 2001)
  ... aka Gilmore Girls: Beginnings (USA: rerun title)
       - Like Mother, Like Daughter (2001) TV episode .... Aubrey
• Triangle Square (2001) .... Julie
• Thank You, Good Night (2001) .... Janine
• Murder Seen (2000) (TV) .... Zoey Drayden
  ... aka Murder Scene (USA: MIFED title)
• Submerged (2000) .... Tiffany Stevens
  ... aka Destination: Impact (Europe: English title)
• "The Outer Limits" .... Sarah Burnham (1 episode, 2000)
  ... aka The New Outer Limits (USA: promotional title)
       - Revival (2000) TV episode .... Sarah Burnham