Russell Crowe's girlfriend Britney Theriot joins him on stage as they perform with his band Indoor Garden Party in Sydney

Russell Crowe hit the stage in Sydney on Saturday as part of his Indoor Garden Party Tour.

The Gladiator star, 59, who is playing a series of gigs on the east coast, performed at The Bridge Hotel.

Russell was joined on stage by his American girlfriend Britney Theriot, 31, who served as a back-up singer.

The actor looked dapper in a black suit and matching coloured buttoned shirt as he sang on stage.

The actress-turned-real estate agent showed off her figure in a mini black dress and white sneakers.

Russell Crowe, 59, (left) and his girlfriend Britney Theriot, 31, (right) performed on-stage with his band Indoor Garden Party in Sydney on Saturday night

Russell Crowe, 59, (left) and his girlfriend Britney Theriot, 31, (right) performed on-stage with his band Indoor Garden Party in Sydney on Saturday night

The Gladiator starm who is playing a series of gigs on the east coast, looked right at home as he performed at The Bridge Hotel

The Gladiator starm who is playing a series of gigs on the east coast, looked right at home as he performed at The Bridge Hotel 

Earlier in the night, the couple were seen carrying their belongings as they arrived to the venue.

Britney kept warm in a leopard print coat and black flare pants as she prepared to hit the stage.

NRL star Sam Burgess and his pregnant girlfriend Lucy Graham also attended the event, cheering on Russell and Britney from the sidelines. 

Russell is booked for more performances in Coffs Harbour, Port Macquarie, Sydney, Melbourne and Brisbane in the coming weeks.

He will play the Sydney Opera House on June 9, with Marcia Hines appearing as a special guest.

The actor looked dapper in a black suit and matching coloured buttoned shirt as he sang on stage

The actor looked dapper in a black suit and matching coloured buttoned shirt as he sang on stage

The actress-turned-real estate agent showed off her figure in a mini black dress and white sneakers

The actress-turned-real estate agent showed off her figure in a mini black dress and white sneakers

Earlier in the night, the couple were seen carrying their belongings as they arrived to the venue

Earlier in the night, the couple were seen carrying their belongings as they arrived to the venue

Russell has described his Indoor Garden Party shows as 'an event, a band, a happening'.

'It's fluid. The personnel changes, but it's always big. It's like a festival where I gather people I admire, musicians and storytellers, and we put on a show,' he said.

Despite his successful acting career, Russell has always had an interest in singing.

In the 1980s he recorded a track called I Want to Be Like Marlon Brando under the name Russ le Roq.

He soon became the lead singer of the band 30 Odd Foot of Grunts.

Sam Burgess and his pregnant girlfriend Lucy Graham (both pictured) attended the event, cheering on Russell and Britney

Sam Burgess and his pregnant girlfriend Lucy Graham (both pictured) attended the event, cheering on Russell and Britney

Russell is booked for more performances in Coffs Harbour, Port Macquarie, Sydney, Melbourne and Brisbane in the coming weeks

Russell is booked for more performances in Coffs Harbour, Port Macquarie, Sydney, Melbourne and Brisbane in the coming weeks

He will play the Sydney Opera House on June 9
Marcia Hines will be appearing as a special guest

He will play the Sydney Opera House on June 9, with Marcia Hines appearing as a special guest

Russell has described his Indoor Garden Party shows as 'an event, a band, a happening'

Russell has described his Indoor Garden Party shows as 'an event, a band, a happening'

Russell and Britney are regularly seen jetting between Sydney and Coffs Harbour, where the actor is building a $400million film studio dubbed 'Aussiewood'.

The Beautiful Mind star owns a 400-hectare farm in nearby Nana Glen, and divides his time between this rural estate and his home in Sydney.

The pair confirmed their long-rumoured romance with a kiss on the tennis court back in November 2020.

He is believed to have first met Britney, a former actress who is the spitting image of Russell's ex-wife Danielle Spencer, on the set of his 2013 film Broken City.

Despite his successful acting career, Russell has always had an interest in singing

Despite his successful acting career, Russell has always had an interest in singing

Russell and Britney are regularly seen jetting between Sydney and Coffs Harbour, where the actor is building a $400million film studio dubbed 'Aussiewood'

Russell and Britney are regularly seen jetting between Sydney and Coffs Harbour, where the actor is building a $400million film studio dubbed 'Aussiewood'

The pair confirmed their long-rumoured romance with a kiss on the tennis court back in November 2020

The pair confirmed their long-rumoured romance with a kiss on the tennis court back in November 2020