Melissa Joan Hart feels 'guilty' for taking an underage Britney Spears to her 1st nightclub in the '90s

As a teenage actress in the 1990s, Melissa Joan Hart shared a strong bond with a handful of other young stars in the spotlight, including Britney Spears. 

In a new interview, the "Sabrina the Teenage Witch" star opened up about her past friendship with the "Toxic" singer and revealed why she feels "really guilty" to this day about introducing the nightlife to Spears. 

"Britney and I got to do a lot of press together. And we had a lot of fun together during this time," Hart, who starred...