It was clearly difficult for Sienna Miller to resist Newfoundland puppy Nana when she was a tiny black bundle.

But it seems the American Sniper actress failed to factor in the breed's astonishing growth rate – they can weigh up to 9st and measure 6ft from nose to tail.

Now three years after bringing Nana home, the dog has been adopted by Sienna's stepmother Kelly Hoppen, who owns a sprawling estate in the Cotswolds.

It's a sensible move – Sienna, who has a two-year-old daughter, Marlowe, and another dog, Bess – previously admitted that on walks Nana 'pulls me over flat on my face into the mud'.

Three years after bringing Nana (right) home, the dog has been adopted by Sienna Miller's (pictured) stepmother Kelly Hoppen

American Sniper star Sienna (pictured) admitted that on walks Nana 'pulls me over flat on my face into the mud'

Stephen Hawking rubs shoulders with showbiz stars at Jimmy Carr's party

You'll never guess who was the biggest star at comedian Jimmy Carr's Mexican-themed Bank Holiday party last week… Professor Stephen Hawking!

The pair first became acquainted in 2013 during the interval of a West End play and have since become firm friends.

Stephen has also been getting a taste for the showbiz world since he became the subject of the Oscar-winning film The Theory Of Everything. Carr's other party guests included Robbie Williams, David Walliams and Holly Valance.

Hawking usually attends get-togethers at Cambridge's mathematics and theoretical physics department – I bet the crowd there is rather different!

Stephen Hawking (left) and Jimmy Carr (right) first became acquainted in 2013 during the interval of a West End play and have since become firm friends

With red lips and porcelain skin, Joan Collins looks every inch the Hollywood siren from her Dynasty days.

But the portrait by Patrick Procktor was made in 1977 – four years before Joan gave us Alexis Carrington.

The painting hangs in the Redfern Gallery in Piccadilly, and has evoked much interest since Joan became a dame this year. Told that it's now for sale at £4,500, the star quipped: 'Does this mean I've gone up in value too?'

The painting of Joan Collins (pictured) which hangs in the Redfern Gallery in Piccadilly has evoked much interest since Joan became a dame this year

I am delighted to report that the Marquess of Bute and his wife Serena are back together.

The couple split up last year after 16 years of marriage but as my source explains: 'By some miracle they are back together.