Images via Instagram,

Last time we reported on Tammin Sursok’s colour change we almost gave away an important Pretty Little Liars plot line, we promise not to do that again.

Well, not on purpose.

The 31-year-old has reversed her blonde hair back to her natural brown, and the rumour is it’s for a new role. i.e. Nothing to do with her role as Jenna in Pretty Little Liars. The ex-Home & Away star uploaded a photo of her new hair yesterday with the caption: ‘New hair. New day.’

We may be looking into it a bit too closely, but she doesn’t look overwhelming happy about her latest hair colour. Don't you think?

http://cdn.theglow.com.au/app/uploads/2015/02/Screen-Shot-2015-02-03-at-9.39.03-AM.png See?

She captioned the above image tagging in her colourist, Britt King with: 'Hey brown hair- we meet again.'

Cara Delevingne has shaved her head (Sort of).

Take a peek through her Instagram page and you'll in see her latest photo she has blonde hair. Yesterday it was brown, three weeks ago it was blonde, and in a flashback holiday snap taken in Cambodia she's was brunette again, followed by blonde, followed by brown.

Has found some magic formula for not shredding her hair every time she colours it? Is she trying to keep the Pretty Little Liars fans on edge? Or like Bec Hewitt, does she suffer from post Home & Away colourchangeitis?

It's official, we can't keep up.

23 times Bec Hewitt changed her hair colour.

For more recent celebrity hair transformations, take a look at the gallery below.

The best celebrity hair transformations

Kerry Washington

Nicole Ritchie

Julia Roberts.

Mindy Kaling

Mindy Kaling.

Nicole Ritchie

Audrina Patridge

Sia Furler

Kate Bosworth

Cara Delevingne

Jackie O.

Lisa Kudrow

Cara Delevingne

Lena Dunham

Zoe Foster Blake

Nat Bassingthwaighte

Bella Heathcote

Rosie Huntington-Whiteley

Claire Holt

Jess Hart

Jessica Mauboy

Elizabeth Olsen

Sarah Wilson

Gwen Stefani

Gwen Stefani

#GrannyHair: Zosia Mamet

Freida Pinto