Ashlee Simpson wears a low-cut top in Studio City… after a surprise show with Demi Lovato

Ashlee Simpson wears a low-cut top in Studio City… after a surprise performance with Demi Lovato

Ashlee Simpson appeared stylish and happy on Friday as she stepped out in Studio City, Calif.

The 37-year-old mum-of-three rocked a plunging black top, baring a bit of her cleavage, days after her triumphant return to the stage.

On Wednesday, she joined Demi Lovato in Los Angeles for a surprise duet of her 2004 hit La La.

Peachy: Ashlee Simpson appeared stylish and happy on Friday as she stepped out in Studio City, California

Ashlee smiled softly as she wore a stylish pair of dark rectangle-shaped sunglasses with a dark sweater draped over her shoulders.

Her light brown hair was neatly parted down the middle with the front strands tucked behind her ears.

Her shiny tresses fell over her shoulders and down her back, cascading in a loosely textured pattern.

She wore small hoop earrings and a delicate necklace with multiple charms, adding a black leather Chanel clutch to her body.

The 37-year-old mum-of-three rocked a plunging black top, showing off a bit of her cleavage, days after her triumphant return to the stage

The 37-year-old mum-of-three rocked a plunging black top, showing off a bit of her cleavage, days after her triumphant return to the stage

It had a classic chain strap with interwoven leather, and the designer bag was accented with a fuzzy pink ornament that hung down the side.

Simpson, who is married to Diana Ross’ son Evan Ross, teamed her look with a pair of charcoal gray denim jeans.

They had a tear at the knee and a slightly rolled up and frayed hem, and her sleeveless top was tucked in there.

Finally, Ashlee, officially married to rock star Pete Wentz, slipped her feet into a pair of black backless flats.

The outing comes two days after she took the stage for her first performance in a very long time.

Simpson shot to fame as a singer-songwriter in the early 2000s, following in the footsteps of her famous big sister Jessica Simpson, 42.

Ashlee has made a name for herself as a pop-rock, rebellious antidote to her brother’s clean, squeaky bubblegum pop image.

Her debut album Autobiography became a huge hit after its release under Geffen.

Living legends: The two stars brought great energy to their surprise duet on Wednesday night

Ashlee made a powerful return to the stage

Living legends: The two stars brought great energy to their surprise duet on Wednesday night

Demi brought Ashlee on stage to sing with her as she transitioned from her song La La Land to Ashlee’s song Y2K.

It came after Ashlee took to social media earlier today to tease that she had a “surprise” for her Los Angeles fans.

After the show, Demi posted snippets of the performance and simply wrote in the caption, “Thank you @ashleesimpsonross.”

They miss her!  After the show, fans took to Twitter to express their excitement for Simpson's music

They miss her! After the show, fans took to Twitter to express their excitement for Simpson’s music

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