The former S Club star gave birth to her second daughter, Minnie, on April 1.
She is also mum to 3-year-old daughter Amelie with husband Alex Bourne.
Rachel stars on this month’s cover of FHM after being voted ‘All Time Sexiest Woman’ of FHM.
The 36-year-old told the mag: 'To win this award feels absolutely amazing. I've worked with FHM fir the past decade and a half, I feel such a strong bond to the magazine, and it's so flattering to think that people think of me that way. It's brilliant!'
'The first cover I shot in 2000 was really exciting, because at that time we were really young- I was 22- and we were used to being kiddy and sweet and nice. It was an opportunity to be a bit more grown up, to be more womanly and sexy.'
FHM’s deputy editor Dan Jude says: 'It's fantastic to see Rachel take the number one spot. She's been a part of FHM for14 years now, and after all this time readers clearly still love her!'