Sienna Miller, 42, plants a kiss on Kelly Hoppen as her former stepmother celebrates 65th birthday with glitzy party

Kelly Hoppen is clearly no wicked stepmother. 

As she celebrated her 65th birthday, the interior designer was joined by Hollywood star Sienna Miller, 42, who was her stepdaughter during her 14-year marriage to American former banker and art dealer Edwin Miller.

The pair tied the knot in 1989 when the actress was just six years old and her sister Savannah was seven. 

Displaying their mutual affection, they kissed each other on the lips at the Michelin-starred River Cafe in Hammersmith, West London.

‘Big love,’ Hoppen wrote next to the photograph, which she shared online.

Hoppen also praised Miller’s outfit, sharing a snap of the star with Bruno Tonioli and revealing she planned on buying it herself

Hoppen also praised Miller’s outfit, sharing a snap of the star with Bruno Tonioli and revealing she planned on buying it herself. 

She shared: ‘Love @siennathing outfit from her collection that she wore to my birthday @marksandspencer am off to get it.’  

A favourite interior designer of the Princess of Wales, Hoppen still considers herself to be Miller’s stepmother.

She previously explained: ‘I’ve never understood when people say “Sienna’s ex-stepmother”, because if you love a child and you are there for a majority of their childhood, you don’t just switch that off.’

‘Ed and I parted on good terms and Savannah calls me Mama K and Sienna calls me Celtic Wizard — we have nicknames for each other.’

Discussing how attitudes to ‘blended families’ were different in the Nineties, Kelly added: ‘You’ve got to remember I’m 64 and being stepmum to them was not normal back then – these kinds of extended families.

‘When I used to stand at the school gates, I was frowned upon like I was the other woman, and it was tough for me.’

Kelly, who has one biological daughter, food writer Natasha Corrett says: ‘If I didn’t have Sienna or Savannah, I would have felt cheated that I didn’t have another child.’

A favourite interior designer of the Princess of Wales , Hoppen still considers herself to be Miller’s stepmother, saying ‘if you love a child and you are there for a majority of their childhood, you don’t just switch that off’ (pictured in 2001)

Speaking of her relationship with Savannah and Sienna in Mail on Sunday’s YOU magazine in 2020, Kelly said: ‘She [Savannah] and her (actress) sister Sienna are and will always remain two of the most precious people in my life – even though I have been divorced from their father Edwin for 17 years.

‘She calls me Mama K and I call her Sasa. She and Sienna always send me cards and flowers on Mother’s Day, which really touches my heart.’

Meanwhile Sienna recently expanded her family, after she welcomed a baby girl with her boyfriend Oli Green, 27. 

The actress already has daughter Marlowe, 10, from her previous relationship with actor Tom Sturridge, 38. 

Kelly and Sienna’s father – American former banker and art dealer Edwin Miller – tied the knot in 1989 when the actress was just six and her sister Savannah was seven (pictured in 2015)