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The singer, 26, gave birth to daughter Angel at a hospital in Tooting, South London, on Saturday.
She was revealed to be having an affair with the So Solid Crew rapper in November 2006 while he was still married to Strictly Come Dancing winner Alesha Dixon.
The couple are expected to marry later this year.
Hylton recently insisted that she has no regrets about her part in the breakdown of Harvey's marriage.
