Christina Aguilera goes make-up free in a black hoodie and tracksuit bottoms

Christina Aguilera goes make-up free in a black hoodie and tracksuit bottoms before getting glammed up for Jimmy Kimmel Live in Los Angeles

She appeared on Jimmy Kimmel Live in Los Angeles on Tuesday, looking sensational in a lustrous black dress.

But ahead of the appearance, Christina Aguilera looked much lower-key as she was snapped entering the Hollywood-based studios.

The singer, 39, went make-up free as she covered up in a black hoodie, tracksuit bottoms and shades.

Pre-glam: Christina Aguilera looked low-key as she was snapped entering the Hollywood-based studios of Jimmy Kimmel Live on Tuesday

Hood up, she kept her platinum locks swept back as she clutched a bottle of water.

She added trainers to the look, seen heading in to get glammed up before going on air.

The comfy look was a far cry from her appearance as she exited the show at the end of the night.

Low-key: The singer, 39, went make-up free as she covered up in a black hoodie, tracksuit bottoms and shades

Low-key: The singer, 39, went make-up free as she covered up in a black hoodie, tracksuit bottoms and shades

Dressed down: Hood up, she kept her platinum locks swept back as she clutched a bottle of water

Dressed down: Hood up, she kept her platinum locks swept back as she clutched a bottle of water

Minimalist: She wore a muted ensemble as she departed the taping later in the night

Minimalist: She wore a muted ensemble as she departed the taping later in the night

Christina put on a busty display in the low-cut silky dress, and she matched it with a pair of knee-high black latex boots.

She stayed warm on the chilly evening and covered up in an oversize olive overcoat, which reached down to her knees and had to have the sleeves rolled up to expose her hands.

She wore her platinum blonde hair tied back in a high ponytail, with separate strands framing her impeccably made-up face.

Shiny shoes: She matched it with a pair of knee-high black latex boots

Staying warm: She covered up with an oversize olive overcoat

Shiny shoes: She matched it with a pair of knee-high black latex boots and wore an oversize olive overcoat

Swallowed up: The large coat reached down to her knees, and she had to roll the sleeves up to expose her hands

Swallowed up: The large coat reached down to her knees, and she had to roll the sleeves up to expose her hands

Stunner: She wore her platinum blonde hair tied back in a high ponytail, with separate strands framing her impeccably made-up face

Stunner: She wore her platinum blonde hair tied back in a high ponytail, with separate strands framing her impeccably made-up face

Christina was making the rounds to help promote the new Disney live-action remake of it’s hit 1998 film Mulan.

The original film helped launch Christina’s career, as she recorded a version of the film’s song Reflection, which was released as her debut single.

Filipina singer and actress Lea Salonga supplied Mulan’s singing voice and performed the song in the original movie, while Christina sang an end-credits version released as a single.

The song’s success and her command of her upper register won her a recording contract with RCA, and the song was later included on her debut eponymous album. 

Vocalist: Christina Aguilera, who sand Reflection on the original Mulan soundtrack, looked radiant in red

Radiant in red: Christina looked stunning in a red Galia Lahav design at the premiere of Disney’s live-action Mulan remake on Monday

Classic track: She recorded a new version of her debut single Reflection, along with a new song for remake, which isn't a musical

The beginning: The original version helped her land a record deal with RCA

Classic track: She recorded a new version of her debut single Reflection, along with a new song for remake, which isn’t a musical. The original version helped her land a record deal with RCA

Christina re-recorded Reflection for the Mulan remake, as well as a new song, Loyal Brave True.

During an interview for Forbes, the original songwriter Matthew Wilder explained that, though the new movie doesn’t have songs, Reflection is woven throughout its score.

‘I can tell you that there are there’s a new version of Reflection, and that song thematically plays a large part in the new movie throughout the score,’ he explained. ‘The film is not song-driven, but my music is present.’