The maths pro welcomed her daughter into the world in December last year with her husband and former Strictly Come Dancing professional Pasha Kovalev, 40.
Announcing their happy news to the world, Rachel wrote to her Twitter followers: “2 weeks after we were expecting her this little one finally made an appearance!
“Miss Maven (one who understands) Aria (lioness) Riley Kovaleva arrived on Sunday morning weighing in at 7lbs 4,” she confirmed.
“After keeping us waiting she came so fast we didn’t get to hospital & was born in our bathroom with our amazing doula & wonderful St Mary’s midwives rushing over to be with us just in time!”
The star went on to say: “She’s absolutely perfect & Pasha & I are in newborn bliss. Couldn’t be more in love.”