Reigning DWTS champion Rumer Willis puts on a very busty display in a plunging white bralet as she returns for season premiere

She's the reigning champion of Dancing With The Stars.

And Rumer Willis was keen to show her support to the ABC dancing contest as she returned to the studio in Hollywood, California, to watch the premiere of season 21 on Monday.

As she was on the other side of the stage, Rumer, 27, made certain to turn heads with her choice of attire.

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Dancing queen: Dancing With The Stars champ Rumer Willis put on a very busty display in a plunging white bralet as she returned to the ABC studio in Hollywood, California, for the premiere of the 21st season on Monday

Dancing queen: Dancing With The Stars champ Rumer Willis put on a very busty display in a plunging white bralet as she returned to the ABC studio in Hollywood, California, for the premiere of the 21st season on Monday

The daughter of Bruce Willis and Demi Moore put on one very busty display as she left little to the imagination in a plunging white bralet top.

Rumer chose to forgo a bra and allowed her sizable breasts to sit freely, partially encased in the skimpy garment.

The Pretty Little Liars actress teamed the boob-baring top with a matching white structured skirt which sat high on her waist and revealed a glimpse of her taut tummy.

White hot: Rumer, 27, left little to the imagination in the skimpy satin top which she teamed with a striped high-waisted skirt
White hot: Rumer, 27, left little to the imagination in the skimpy satin top which she teamed with a striped high-waisted skirt

White hot: Rumer, 27, left little to the imagination in the skimpy satin top which she teamed with a striped high-waisted skirt 

Dancing shoes: The Pretty Little Liars actress was seen prancing around outside the ABC studios in a pair of heeled gold courts when the show wrapped

Dancing shoes: The Pretty Little Liars actress was seen prancing around outside the ABC studios in a pair of heeled gold courts when the show wrapped

Fancying seeing you here? The soon-to-be Broadway star received a very warm welcome from the cast and crew

Fancying seeing you here? The soon-to-be Broadway star received a very warm welcome from the cast and crew

Best seat in the house: Rumer braved going braless allowing her sizable breasts to run free as she sat on the front row 

Best seat in the house: Rumer braved going braless allowing her sizable breasts to run free as she sat on the front row 

Reunited: The 27-year-old posed for an obligatory selfie with her former dancing partner Valentin Chmerkovskiy

Reunited: The 27-year-old posed for an obligatory selfie with her former dancing partner Valentin Chmerkovskiy

Showing their support: Rumer watched the season premiere alongside another of Valentin's former partners - actress and mathematician Danica McKellar

Showing their support: Rumer watched the season premiere alongside another of Valentin's former partners - actress and mathematician Danica McKellar

Rumer was suitably made up with generous lashings of black mascara and pristine lines of eyeliner widening her big brown eyes.

Her jet-black pixie crop-cum-bob looked extra glossy with her side-fringe perfectly framing her face.

During her time at the studio, she made time to catch up with her former dancing partner - Valentin Chmerkovskiy.

The duo posed for a sweet snap following his performance with chat-show host and R&B singer Tamar Braxton.

'So proud': The raven-haired dancer and actress congratulated her former partner and his new sidekick - chat-show host and R&B singer Tamar Braxton - on their performance

'So proud': The raven-haired dancer and actress congratulated her former partner and his new sidekick - chat-show host and R&B singer Tamar Braxton - on their performance

'So proud of this guy!! @iamvalc you and @tamarbraxtonher killed it tonight. So happy I was there to root you guys on. #DWTS #teamvalentay,' Rumer beamed alongside the audience selfie.

She watched the line-up's debut with another former on-screen partner of Valentin - actress and mathematician Danica McKellar.

Rumer recently returned to the dance studio after stress fractures in her right foot put her out of action for weeks.

Back in action: Rumer recently returned to the dance studio after stress fractures in her right foot put her out of action for weeks

Back in action: Rumer recently returned to the dance studio after stress fractures in her right foot put her out of action for weeks

'So happy and tired after my first day back dancing,' she informed her Instagram followers last week.

It's just in time as well as she's scheduled to make her Broadway debut in musical Chicago on September 21.

She'll take on the role of Roxie Hart for a seven-week engagement ending November 1.

No rest for the wicked: Rumer hot-footed it back to New York for Broadway Chicago rehearsals after a brief trip back to Hollywood

No rest for the wicked: Rumer hot-footed it back to New York for Broadway Chicago rehearsals after a brief trip back to Hollywood

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