The Dutch-beauty currently stars alongside Justin Bieber in the Calvin Klein Jeans campaign in which the pair are pictured in a number of sexy poses including one where Lara has her hand down the 21-year-old's trousers.
A source told the site: "She has been really sexing it up lately, while she and David have not been spending any time together. People are speculating that David is really, really jealous and insecure about her.’Despite his heartbreak, it's business for usual for David, who is celebrating World Book Day with a helicopter tour of schools.
Yesterday the childrens book writer assured fans he would still be keeping his commitments.
He posted on Twitter: "The #Walliams Whirlwind helicopter tour of schools for @World Book Day UK tomorrow will go ahead as planned so not to disappoint my young fans."Today he added: "It's finally here, @World Book Day UK & the #Walliams Whirlwind is about to begin! It is due next year and we both couldn't be happier.
The 44-year-old David will stop at nothing to romance the 27-year-old bombshell, according to sources.
An insider told The Mirror: "It’s a slow-burner but David has made his feelings clear.
As for Ashley - who previously dated fellow MIC star Ollie Locke during her stint on the show - also became single earlier this year.
The stunner split form Xtra Factor presenter Matt Richardson in January.The programme first aired on BBC Three before moving to the more mainstream BBC One.A successful live stage show of the series, Little Britain Live, was produced in 2006.In 2005 Walliams, Simon Pegg, Lucy Davis and Lauren Laverne starred in the video for Charlotte Hatherley's single Bastardo.Later in the year, Walliams presented a documentary on James Bond, entitled David Walliams: My Life with James Bond.Lara left the family home – which the couple share with their one-year-old son Alfred – on Tuesday, leaving David "devastated".