Adele, Rihanna, Lady Gaga Lead Billboard Award Finalists

Lil Wayne and LMFAO are also double-digit contenders for the May 20 show.

Following her Grammy triumph
 in February, May 20 could be another big night for Adele, as the British siren is a finalist in 18 award categories at the Billboard Music Awards.

According to Billboard, Adele is leading in categories including Top Artist, Top Female Artist and Top Billboard 200 Artist. Her breakthrough hit, "Rolling in the Deep," is a contender in seven different categories.

Adele has plenty of female companionship, as Rihanna and Lady Gaga are also finalists in a number of categories, with 13 for RiRi and 10 for Lady Gaga. Lil Wayne is also up for 10 categories, while party rockers LMFAO are finalists in 17.

The awards are based on Billboard's chart rankings, and combine data from album sales and downloads, track downloads, radio airplay and touring in addition to streaming and social interactions with fans on Facebook, Twitter, Vevo, YouTube, Spotify and other popular online music services. The show will take place at Las Vegas' MGM Grand and be broadcast live on ABC on May 20.

Among the leading categories:

Top Artist: Adele, Lady Gaga, Lil Wayne, Katy Perry, Rihanna.

Top New Artist: Bad Meets Evil, Big Sean, Foster the People, Scotty McCreery and Wiz Khalifa.

Top Male Artist: Justin Bieber, Chris Brown, Drake, Lil Wayne, Bruno Mars.

Top Female Artist: Adele, Lady Gaga, Nicki Minaj, Katy Perry and Rihanna.

Top Duo/Group: Black Eyed Peas, Coldplay, Lady Antebellum, LMFAO and Maroon 5.

Top Billboard 200 Album: Adele 21, Michael BubléChristmas, Drake Take Care, Lady Gaga Born This Way and Lil Wayne Tha Carter IV.

Top Pop Album: Adele 19, Adele 21, Michael Bublé Christmas, Lady Gaga Born This Way and Justin Bieber Under the Mistletoe.

Top R&B Album: Beyoncé 4, Mary J. Blige My Life II... The Journey Continues (Act 1), Chris Brown F.A.M.E., Jennifer Hudson I Remember Me and Rihanna Talk That Talk.

Top Rap Album: Bad Meets Evil Hell: The Sequel, Drake Take Care, Jay-Z & Kanye West Watch the Throne, Lil Wayne Tha Carter IV and LMFAO Sorry for Party Rocking.

Top Rap Artist: Drake, Lil Wayne, LMFAO, Nicki Minaj and Wiz Khalifa.

Top Rock Artist: The Black Keys, Coldplay, Foster the People, Foo Fighters and Mumford & Sons.

Top Hot 100 Song: Adele "Rolling in the Deep," LMFAO feat. Lauren Bennett & GoonRock "Party Rock Anthem," Maroon 5 Feat. Christina Aguilera "Moves Like Jagger," Katy Perry Feat. Kanye West "E.T." and Pitbull Feat. Ne-Yo, Afrojack & Nayer "Give Me Everything."