Jessica Simpson leaves fans baffled after they notice something different in latest post

Jessica Simpson fans have all been pointing out the same thing after her latest Instagram upload.

The 44-year-old 'Irresistible' singer recently took to Instagram to share with her 6.3 million followers the latest in her music career, teasing some exciting news that more music may be on the way sooner than we think.

Jessica's last original studio album, Do You Know, was released yonks back in 2008 - but it seems she's hinting at her return once again.

Jessica Simpson left fans stunned (Jim Spellman/Getty Images)

She captioned the post: "I can't wait for y'all to hear the soundtrack of my soul."

However, it wasn't the music news which caught fans' attention - it was Jessica's new look.

It didn't take long for fans to rush to the comments to share their reactions to the snap, with one Instagram user hitting out: "I don’t even recognise this person."

"But, who is this, even? It doesn’t even look like Jessica Simpson," a second piped up.

A third quipped: "Woah. You don’t look like Jessica."

"Would have never known this is Jessica Simpson," penned a fourth, while a fifth chirped: "I had no idea who this was!"

And another fan declared: "This is a Jess Simpson body double."

The 44-year-old 'Irresistible' singer teased new music for her fans (Instagram/@jessicasimpson)

Others, however, were far more supportive with one fan complimenting: "You're so gorgeous baby girl!"

A second defended: "Can a girl not look this good in her 40s??"

"Getting new Jessica Simpson music wasn't on my bingo card for this year or next!" gushed a third.

Another beamed: "You look fabulous. I look forward to it."

And a final Instagram user added: "She seems healthy, happy, and free so maybe yall should just applaud her for living authentically and keep it moving."

Jessica previously opened up about how she uses her fashion and style to help her get in the right 'vibe' for her long-awaited return to music.

"There's a rock and roll western vibe that runs through the pieces of this collection," she told People in the interview speaking of her clothing brand's new autumn/winter collection. "It is a celebration of how different forms of artistic expressions are woven together."

She added: "If I dress the part of what I am feeling artistically I am better able to express myself in the words and music I am writing."

Explaining that involves 'lots of fringe, lots of turquoise, high heels and lots of slip dresses, short and long', Jessica shared: "I kind of created my own style based on the songs I am singing."