Lady Gaga has had plenty of praise and endorsements from a variety of sources. Her fans buy millions of her albums and sell out venues all over the country. Critics regularly laud her for her interesting explorations of pop music and fascinating approach to theatricality. But she just got a particular endorsement that pleases her profoundly and gave her a flashback to her previous career.

Today on Ryan Seacrest's radio show, Gaga phoned in to talk about her duet with John at the Grammy Awards and what lies ahead for her ongoing (and ever-evolving) Monster Ball tour. At the end of the interview, Seacrest played Gaga some audio of metal legend Ozzy Osbourne, who recently spoke to the "American Idol" host.

"She's very clever, very interesting," Ozzy said of Gaga on Seacrest's show. "She's wacky and I like the zaniness of that woman."

This news pleased Gaga to no end. "Are you kidding? I'm the biggest Black Sabbath fan on Earth!" She even told Seacrest a story about how when she was a go-go dancer, one of her show-stopping numbers was to the Sabbath tune "Black Sabbath" (which, considering it's plodding pace and high volume, seems extremely difficult).

This brings up an interesting question: What other metal is Gaga into? Considering her penchant for fake blood, does she endorse GWAR? Does her melding of glam and gutter make her a Mótley Crüe enthusiast? Or does she really just like getting down to Iced Earth albums?

What do you think? What other metal bands should Gaga look into? Leave your thoughts in the comments!