She's known for her trademark dark lips and stylish black attire.

But on Tuesday Lorde swapped her usual look for a more casual ensemble.

The 17-year-old chart topper flashed a huge smile as she stepped out in jeans and a white singlet to greet adoring fans after her concert at The Greek in Los Angeles, California.

Scroll down for video

Teen royalty: Lorde was all smiles as she stepped out on Tuesday to greet adoring fans after her concert at The Greek in Los Angeles, California

Lorde, real name Ella Yelich-O'Connor, ditched the dark outfits as she surprised admirers with an impromptu meet and greet.

The Grammy Award winner flashed her pearly whites as she appeared overjoyed at the sight of her loving fan base.

The hit maker signed autographs and posed for photos as her bodyguard protectively stood by.

She swapped her concert clothes for comfortable jeans and a white singlet, keeping her feet warm in black boots.

Although her heavy lipstick was nowhere to be seen, the New Zealand songstress still flaunted her luscious, curly hair.

Dressing down: The 17-year-old donned a white singlet and casual pair of blue jeans for her impromptu meet and greet

Trademark: Although her heavy lipstick was nowhere to be seen, the New Zealand songstress still flaunted her luscious, curly hair

A star-studded crowd turned out to watch the teenager perform, with Vanessa Hudgens and Seth Green making an appearance.

Vanessa, 25, was accompanied by her long-time boyfriend Austin Butler, 23, who is best known for his role on the now cancelled show, The Carrie Diaries.

Actress Vanessa tried to stay low key by shielding her face, but her bright red locks meant she was easily recognisable.

It looked like the starlet had been taking style tips from Lorde as she stepped out in a black outfit, complete with leather jacket and floppy hat.

Date night: A star studded crowd turned out to watch the teenager perform, with Vanessa Hudgens and boyfriend Austin Butler making an appearance

I spy: Actress Vanessa tried to stay low key by shielding her face, but her bright red locks meant she was easily recognisable

Seth and his wife Clare Grant looked loved-up as they strolled along hand in hand.

Forty-year-old Seth also donned a leather jacket, but broke up the black with blue jeans and a printed shirt.

The former Buffy The Vampire Slayer star somewhat matched with his partner, who also wore a pair of jeans.

Happy together: Seth Green also attended the concert with his wife Clare Grant

Staying warm: The 40-year-old actor donned a leather jacket, but broke up the black with blue jeans and a printed shirt

Double trouble: The former Buffy The Vampire Slayer star almost matched his partner, who also wore a pair of jeans

Lorde, who was grinning from ear-to-ear after her concert, certainly has every reason to smile.

She recently joined forces with some of the music world's biggest names for the new Children In Need track.

The distinctive singer is accompanied by the likes of Pharrell Williams, Kylie Minogue and Queen's Brian May on a charity reworking of the Beach Boys' 1966 classic God Only Knows.

Dubbed The Impossible Orchestra, the collaborative effort was premiered in a unique pan-broadcasting moment on Tuesday when all of the BBC's TV, radio and online channels premiered the track at 8pm, to officially launch BBC Music.

A-listers: Lorde recently joined forces with some of the music world's biggest names for the new Children In Need track

Angel: The distinctive singer is accompanied by the likes of Pharrell Williams, Kylie Minogue and Queen's Brian May on a charity reworking of the Beach Boys' 1966 classic God Only Knows

In the moment: On Thursday Lorde's mother Sonja Yelich took to Instagram to share a behind-the-scenes shot from the star studded film clip

On top of that, Lorde's latest solo song Yellow Flicker Beat already has over three million hits on YouTube.

The song is from The Hunger Games: Mockingjay Part 1 soundtrack, which is yet to be released but will accompany the upcoming film of the same name.

Lorde is the sole curator of the soundtrack and her ballads will provide atmosphere for the movies which star Jennifer Lawrence as heroine Katniss Everdeen.

On her Tumblr the star spoke about the song, revealing the inspiration behind it.

'It’s my attempt at getting inside her head, Katniss’. I hope you like it,' penned the Grammy Award winner.'