She has had a very public breakup with ex-husband Ant McPartlin – and now Lisa Armstrong has unveiled a dramatic hair transformation.

Only a few weeks after she showed her new blond touch on Instagram, she showed a completely different look online yesterday.

When she stepped backstage with other make-up buddies on Strictly Come Dancing, she appeared with stunning long brunette curls.

Lisa Armstrong Hair
She put on a brunette wig. Image: Lisa Armstrong / Twitter

However, not everything was as it seemed – the 42-year-old actually wore a wig.

She wrote next to the headline: "Find the cheater" and added #brunettes #whohasmorefun #strictly.

She was in a black T-shirt with metal piping on the neckline and sleeves.

Lisa Armstrong Hair
Image: Anthony Harvey / BAFTA / REX / Shutterstock

The showbiz community was stunned in January of last year when Lisa and husband Ant announced after eleven years of marriage that they would split up.

The couple had been together for over 23 years and had met as teenagers.

They were divorced during a 30-second hearing before the Central Family Court in October last year.

Lisa Armstrong Hair
Ant McPartlin. Picture: PA

They met in Newcastle for the first time in 1994, before making their vows in 2006 in a stunning country home in Buckinghamshire.

Ant moved on with friend Anne-Marie Corbett, who was used to the former couple's PA.