The DJ showed off her slimline figure as she returned to Radio 1 yesterday after taking maternity leave.
Sara welcomed her son Isaac, her first child with advertising executive Ben Cyzer, in March.
Back to work: Sara Cox showed of her slimmed down figure as she returned to Radio 1 yesterday
She also has a four-year-old daughter, Lola, from her first marriage to DJ Jon Carter.
After spending her twenties as a party-loving 'ladette', the 33-year-old has described motherhood as a turning point in her life.
She has said: 'I think all my priorities have changed. I appreciate calmness and feeling secure, being looked after.
Beaming: The mother of two was all smiles as she arrived
'I enjoy my role as mum and caretaker of the house. I really relish those roles and I think I'm good at them.'
But she was still keen to get back behind the mic, adding: 'I'd go stir crazy if I didn't work.'
'Work and being a mum go quite nicely hand in hand. Each needs the other to keep me sane.'
Before: Sara heading off on maternity leave in February
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