She welcomed her first daughter, Tallulah, with rocker boyfriend Johnny Lloyd in January.
And Billie Piper looked in high spirits as she puffed on a cigarette while socialising outside The Box in Soho for Lily James' 30th birthday party on Sunday.
The TV star, 36, was joined by her other half, 35, at the star-studded bash which was also attended by the likes of Matt Smith, Poppy Delevingne and Laura Carmichael.
Party: Billie Piper looked in high spirits as she puffed on a cigarette while socialising outside The Box in Soho for Lily James' 30th birthday party on Sunday
The actress cut a stylish figure in a lilac long-sleeved dress with a floral print and a ruffled finish.
Letting her blonde locks hang loose down her shoulders, Billie laughed and chatted with her pals outside the venue as they celebrated Lily's birthday.
Billie's daughter is her first child with Johnny, who is the former frontman of indie rock group The Tribes.
The pair began dating in 2016 shortly after she split from ex husband Laurence Fox.
Couple: The TV star, 36, was joined by her other half Johnny Lloyd at the star-studded bash
Fashion: The actress cut a stylish figure in a lilac long-sleeved dress with a floral print and a ruffled finish
Party: Letting her blonde locks hang loose down her shoulders, Billie laughed and chatted with her pals outside the venue
Billie's outing comes not long after she shared a sweet snap of Tallulah to announce her arrival in January.
She wrote: 'Two weeks ago our little girl arrived. She has totally blown our minds. I didn’t know what I was missing but it was you
