Sam Taylor-Wood introduces Sarah Brown to teenage fiancé Aaron Johnson

Sam Taylor-Wood and Sarah Brown frequently bump into each other in art and charity circles.

Hosting a special charity screening of her directional debut Nowhere Boy last night, gave the 42-year-old artist the perfect opportunity to introduce the Prime Minister's wife to her teenage fiance Aaron Johnson.

Mrs Brown congratulated the couple on their recent engagement as they joined celebrity pals at the Bafta headquarters in Piccadilly.

Sam Taylor-Wood, Sarah Brown and Aaron Johnson Nowhere Boy' at Bafta, Piccadilly

Mingling: Sam Taylor-Wood and fiance Aaron Johnson joined Sarah Brown at a charity screening of the artist's film Nowhere Boy

After initially keeping their relationship low-key due to their eyebrow-raising age gap, the couple have grown more confident since getting engaged last month.

Wearing a grey belted shirt dress, Mrs Brown was spotted deep in conversation with Taylor-Wood as her toyboy Johnson, 19, listened intently beside them.

Despite their 23 year age gap, the couple said friends and family had been supportive of their relationship.

Flashing her sparkling engagement ring, Taylor-Wood said: 'They have reacted really positively. They know how intensely we feel.'

Sam Taylor-Wood, Sarah Brown and Aaron Johnson UK Premiere of 'Nowhere Boy' at Bafta, Piccadilly

'Could I borrow No.10 for the wedding day?' Taylor-Wood chats to Mrs Brown as Johnson looks on

Sam Taylor-Wood and Aaron Johnson UK Premiere of 'Nowhere Boy' at Bafta, Piccadilly

Bling: Taylor-Wood was sporting a large diamond on her engagement finger

Johnson added: 'My friends and family have been really lovely and supportive.'

After landing a breakthrough film role and a fiancée in the space of a year, he described himself as a 'very lucky man'.

Writing on her Twitter micro-blogging page from the party, Mrs Brown said: 'At screening of Sam Taylor-Wood's feature film Nowhere Boy about John Lennon's early years - am big fan of JL and STW...

'Film screening was for Maggie's Cancer Caring Centres where STW and I are both Patrons.'

Also in attendance last night was Tracey Emin, Sophie Ellis Bextor and her mother Janet Ellis, Edith Bowman, Donna Air and Kimberly Stewart.

Taylor-Wood fell for Johnson nearly a year ago after casting him as a young John Lennon in her directional debut Nowhere Boy, which is set for release in the UK on Boxing Day.

Janet Ellis (left) and Sophie Ellis Bextor arrive for the charity premiere of Nowhere Boy, at BAFTA

Family ties: Sophie Ellis Bextor attended with her mother, former Blue Peter presenter Janet Ellis

The couple went public at the Cannes Film Festival in May - just months after the artist's estranged husband Jay Jopling, 45, had a very public fling with pop star Lily Allen, 23.

However, while that dalliance fizzled out within weeks, sources close to artist-turned-director Sam say she has been quietly dating Aaron for months.

Jay's romance with Lily went public when the pair were photographed all over each other on a Caribbean beach and yacht.

Donna Air arrives for the charity premiere of Nowhere Boy, at BAFTA in Piccadilly
Sarah Brown arrives for the charity premiere of Nowhere Boy, at BAFTA in Piccadilly

Feeling gray: Donna Air (left) and Mrs Brown both went for gray and black

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