Justin Bieber, Jennifer Lawrence, Lady Gaga Top Annual List of Biggest Earners Under 30

Taylor Swift, Taylor Lautner and Kristen Stewart also round out the list of this year's Forbes rankings

Lady Gaga's legions of Little Monsters made the last 12 months very lucrative indeed.

The 27-year old pop diva topped Forbes' list of the top earning celebrities under 30, racking up an estimated $80 million from touring and record sales between June 2012 and June 2013.

Lady Gaga could have had an even greater windfall, Forbes notes, had she not suffered a labral tear of her right hip that forced her to cancel the remainder of her "Born This Way Ball Tour." Had health issues not gotten the best of her, the singer might have made $200 million.

Musical acts ranked high on Forbes' list — with Justin Bieber earning an estimated $58 million from his recent tour and investments in start-ups like Spotify and Taylor Swift banking an estimated $55 million from endorsement deals with Diet Coke and the release of her new album "Red."

Also read: Ab-tastic: Taylor Lautner's Million-Dollar Muscles (Slideshow)

Coming in just behind that duo, Rihanna's ubiquitous single “Diamonds” from her new album, "Unapologetic" helped propel the musical mega-star to $43 million in earnings.

On the movie front, Jennifer Lawrence added some big paydays to the Oscar she won for her starring role in the indie comedy "Silver Linings Playbook." Reprising her role as Katniss in the upcoming sequels to "The Hunger Games" and other film projects netted Lawrence an estimated $26 million.

Her fellow tween icons Taylor Lautner and Kristen Stewart were also well compensated for their roles in another young adult franchise, "Twilight." The co-stars walked off with an estimated $22 million over the last 12 months.

Check out Forbes for the complete list of top earners.