Duo ... Britney Spears and Iggy Azalea performed their song, Pretty Girls. Picture: Denise Truscello/Getty Images Source: Supplied

Swift was named Top Artist overall and Top Female Artist.

The Bad Blood singer dedicated her award “to all the girls out there”.

“I absolutely love you,” Swift said.

White hot ... Taylor Swift. Picture: Getty Images Source: Getty Images

Dressed in a low-cut white jumpsuit with daring cut-outs, Swift hugged and kissed her DJ boyfriend and BFF Ed Sheeran before she collected the award Top Billboard 200 Album for 1989.

She has also claimed the fan-voted Billboard Chart Achievement Award over Meghan Trainor and Iggy Azalea.

PDA ... Taylor Swift and DJ Calvin Harris. Picture: Jeff Kravitz/BMA2015/FilmMagic Source: Supplied

Swift gave a shout-out to her fans.

“I’m obsessed with you. I know you fought really, really hard for this. And I want to shout out of course to Iggy and Meghan.”

And there was almost more silence than Kanye West’s rapping during his performance at the Billboards.

West’s firey performance of the songAll Day was heavily censored, prompting backlash on Twitter.

Loved up ... T-Swizzle and her BF, Calvin Harris. Picture: Jeff Kravitz/BMA2015/FilmMagic Source: Supplied

Tay’s night ... Zendaya, Hailee Steinfeld, Taylor Swift, Lily Aldridge, and Martha Hunt at the Billboards. Picture: Eric Jamison/Invision/AP Source: AP

Star power ... Britney and Iggy performed Pretty Girls live for the first time. Picture: Getty Images Source: Supplied

Sam Smith — who is recovering from surgery on his vocal cords — was not at the MGM Grand in Las Vegas to accept his award for Top Male Artist, beating Drake, Pharrell Williams, Justin Timberlake and Ed Sheeran.

Instead, he appeared via video message where a silent Smith held placards scrawled with handwritten messages.

“Can’t wait to get this surgery out of the way so I can sing,” one of Smith’s posters read.

“Taylor ... put 100 on black of me.”

Winners ... Iggy Azalea and Charli XCX accept the Top Rap Song award for Fancy. Picture: Getty Images Source: Getty Images

Wearing a silver space age outfit, Iggy Azalea and Britney Spears performed their duet, Pretty Girls.

Earlier, Azalea won Top Rap Song for Fancy, and collected the gong with Charli XCX, who features on the track, as well as Top Streaming Artist.

John Legend’s All of Me claimed Top Radio Song and he said the song was inspired by his wife, Billboards co-host Chrissy Teigen.

Only J. Lo could pull off this dress. Picture: Getty Images Source: Getty Images

Mariah Carey performed a medley of songs including a throwback to her 90s power ballad, Vision of Love.

Hosted by model Teigen and Ludacris, Van Halen opened the awards with a performance of Panema.

Blonde ambition ... it’s Britney. Source: AP

Diva ... Mariah Carey. Source: AP

Four-piece ... Liam Payne, Louis Tomlinson, Niall Horan and Harry Styles from One Direction. Picture: Getty Images Source: Getty Images

Duet ... John Legend and Meghan Trainor. Picture: Getty Images Source: Getty Images

Rapper-turned-actor Ludacris described the event as the biggest music party of the year, while Teigen joked that her credentials for hosting were because she’s married to John Legend.

Fringed benefits ... Taylor Swift. Source: Getty Images

Busty ... JLo. Source: Getty Images

One Direction — without Zayn Malik — collected the first award for Top Duo/Group with 1D’s Liam Payne mentioning their ex-band mate in the band’s acceptance speech.

“There’s one more person to share this with, and that’s our brother Zayn,” Payne said.

Pose ... model Jourdan Dunn, designer Olivier Rousteing and Kendall Jenner, wearing Balmain x H & M, at the 2015 Billboard Music Awards. Picture: Getty Images Source: Getty Images

Fierce ... Dencia in an embellished jumpsuit. Picture: Getty Images Source: Getty Images

Date night ... Nick Jonas, right, pictured with his girlfriend Olivia Culpo, performed his song, Jealous. Picture: Getty Images Source: Getty Images

Back to black ... Charli XCX. Picture: AP Source: AP

Swift — who debuted her star-studded video for the song Bad Blood during the broadcast — had 14 nominations, while Aussie rapper Iggy Azalea was up for 12.

Revealing ... Rita Ora in a daring white gown. Picture: Getty Images Source: Getty Images

High ponytail ... Zendaya. Picture: AP Source: AP

Boys ... Fall Out Boy will performs with rapper Wiz Khalifa. Picture: AP Source: AP

The awards were held at the MGM Grand in Las Vegas.

Stripes ... Kylie Jenner. Source: AP

Sleek ... Kendall Jenner. Source: Getty Images

Suited up ... rapper Wiz Khalifa. Picture: AP Source: AP