Sibling support: Rumer Willis proudly films her sister Scout's band at SXSW

Last year, Rumer Willis had several gigs singing with her six-piece band.

But the 24-year-old crooner opted to let younger sister Scout steal the spotlight at SXSW in Austin Saturday.

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Bruce and Demi's daughters: Rumer Willis filmed younger sister Scout performing in her band Gus + Scout at SXSW in Austin Saturday

'My sister Scout's Band #Gus+Scout just killed it @ #SXSW #RollingStoneParty. I could not be more proud of her,' Rumer tweeted to her 230,000 followers.

Rumer flaunted her toned tummy in a hippie paisely top while filming Scout's band while onstage at Wuwufest at Wuwu Sushi.

Her 21-year-old sister wore a striking red dress to perform for the hipster crowd.

Famous sisters: The 21-year-old appeared to be in good spirits, with beer can in hand, ready to front her band

Scout in the spotlight: The 21-year-old crooner wore a striking red dress to perform for the hipster crowd

Old friends: Scout's guitarist was her Idaho childhood friend and Brown University pal Gus Wenner

Scout appeared to be in good spirits, with beer can in hand, ready to front the band alongside her Brown University pal Gus Wenner.

Her band, Gus + Scout, released their first single called Don't Bother You Much last August.

The ombré-haired daughters of Demi Moore and Bruce Willis were both spotted arm-in-arm watching British singer Jake Bugg.

Whistling woman: Her band, Gus + Scout, released their first single called Don't Bother You Much last August

Sing it loud: Scout flaunted her pins in a scarlet strapless high-low frock

Puffed out: The ombré-haired daughter of Demi Moore and Bruce Willis appeared to be wearing minimal makeup aside from mascara

Not seen Saturday was their 19-year-old sister Tallulah and Rumer's boyfriend Jayson Blair, who stars on NBC's The New Normal.

The House Bunny actress had a DJ gig at the Joe Fresh at JCP Launch Event in Beverly Hills last week.

And last year Rumer belted out rock songs and jazz standards at the Sayers Club three times and at the SLS Hotel in Miami.

Music in the blood: Scout's sister Rumer also belted out rock songs and jazz standards at the Sayers Club three times and at the SLS Hotel in Miami last year

Gus + Scout: The colourful four-piece band debuted their music last year

Childhood pals: Gus Wenner and Scout Willis in a promotional shot for their band Gus + Scout

Meanwhile their famous mother Demi was seen Thursday getting a manicure in Los Angeles.

The trio have allegedly lost patience with Demi's wild partying and erratic behaviour following her split from husband Ashton Kutcher.

They were allegedly 'mortified' when she recently started dating Rumer's 26-year-old friend Vito Schnabel.

Runs in the family: The House Bunny actress, seen here with boyfriend Jayson Blair, had a DJ gig at the Joe Fresh at JCP Launch Event in Beverly Hills last week

Trailer snap: The eldest Willis-Moore daughter just finished shooting the romantic comedy, There's Always Woodstock, with Katey Sagal and Jason Ritter

The 50-year-old Ghost star is currently seeking spousal support and money for legal fees from estranged husband in their divorce battle.

And Scout and Rumer's father Bruce was last seen taking his 34-year-old wife Emma Heming and their one-year-old daughter Mabel to the Century City Mall.

The eldest Willis-Moore daughter just finished shooting the romantic comedy, There's Always Woodstock, with Katey Sagal and Jason Ritter.

The Whole Nine Yards actress will also be seen starring in this year's drama, The Odd Way Home, as Maya a quirky small-town girl.