Jessica Simpson has given birth to a son, her second child with fiance Eric Johnson.
The baby, named Ace Knute, was delivered in Los Angeles on Sunday in a planned Caesarean section.
The 32-year-old singer and actress already has a daughter, Maxwell Drew, who was born in May last year.
The details of the birth were first reported by magazines in the US but a spokesperson for Jessica Simpson has since confirmed the news.
She tweeted details of her second pregnancy in December by posting a Christmas picture of her daughter alongside the caption Big Sis.
There had been some concern for Jessica Simpson during her first pregnancy when it went on longer than expected.
Although she rose to fame as a singer, Jessica Simpson has since launched a successful clothing and accessories range.
Most recently she appeared on Fashion Star, an American reality programme.
She has previously starred in other reality shows such as Newlyweds, an MTV series about her marriage to 98 Degrees singer Nick Lachey.
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