Guy Ritchie's model love Jacqui Ainsley looks red hot in a slinky backless dress. No surprises there.

But onlookers at the LA premiere would have been amazed to learn that her sensational appearance comes just three months after the birth of their son.

The blonde bombshell stole the show when the director presented his latest Sherlock movie, once again starring Robert Downey Jr.

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Holding her back protectively with one hand, Guy was obviously proud to have the beauty as his plus one.

Jacqui, 30, and her partner have yet to reveal the name of their little boy, who will be a brother for Guy's two children with ex Madonna – Rocco, 11, and David, six, adopted from Malawi.

The couple, who have been dating for 18 months, are looking more loved up than ever since the new arrival.

A few weeks ago, they were glowing with happiness as they enjoyed a date night on the other side of the Atlantic in London.