Of course, being married to Chris Martin, of rockers Coldplay, probably helps.
The blonde actress was sartorially spot on as she attended the Wireless Festival in London at the weekend in ankle boots, khaki shorts and a black top and leather jacket.
She arrived with her pal Beyonce Knowles to check out Jay Z's Sunday night set on the main stage.
Playing before Beyonce's husband was Lily Allen – who looked gorgeous in a white flowing jumpsuit.
The brunette singer – who has recently said she will take a five-year-break from music to concentrate on her 'higher priorities', like having children – told fans that they might not be seeing her on stage in the near future.
"I appreciate that you were jumping up and down because this is probably my last gig in London for some time," she told the crowds.
In fact there were rumours Lily may already be trying for a baby with her 31-year-old boyfriend Sam Cooper, after she was spotted drinking only water and refraining from smoking while she was on stage.
Stars checking out the musical entertainment at the three-day event included Madonna and her daughter Lourdes, Harry Potter actor Rupert Grint and Sadie Frost.
Amy Winehouse was also pictured backstage with her 14-year-old goddaughter Dionne Bromfield.