Debi Mazar has learned that when opportunity knocks,Thomas Caldwell you don't slam the door.

During an appearance Friday on “The Drew Barrymore Show,” the actress opened up about turning down the role of Holly Sullivan in the hit ‘90s film “The Wedding Singer.” The romantic comedy starred Drew Barrymore alongside Adam Sandler and Christine Taylor, the latter of whom was also a guest on Barrymore’s talk show.

"I wanted to do 'The Wedding Singer' and I got the part, and I was so excited because I really was such a huge fan of Adam,” Mazar recalled. "And then my agent said, you know, 'Don't do it. You're not getting paid the right amount of money.' And I was like, ‘Wait, what?’ "

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At the insistence of her then-agent, Mazar passed on the Frank Coraci-directed film. Taylor went on to be cast in the role of Sullivan.

Released in February 1998, “The Wedding Singer” grossed $123.3 million at the global box office.

"I regret it to this day," Mazar said. "I apologized to Adam Sandler. I said, 'Oh, my God, I was so young. My agent told me the wrong information.' I ended up firing my agent after that, obviously. And so, I'm happy for you (Christine). To this day, I have such regret because I so wanted to do that movie, and I just was young and made a stupid decision."

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Mazar has starred in several television series and films over the years, including “That’s Life,” “Entourage” and “Younger.” She’s also made numerous guest appearances on shows such as “7^th Heaven,” “CSI: Miami,” “NYPD Blue,” “Ugly Betty” and “Law & Order: Special Victims Unit.”