The 34-year-old singer took to her twitter account to reveal she is expecting a double bundle of joy and while the blonde beauty is feeling "pukey" from bouts of morning sickness, she is "so happy" about the news.
In a series of tweets, she wrote: "So tired,so pukey,so pregnant......so happy! X
"Oh & it`s twins!!!!! #arrrrrrrrrrrrgh (sic)"
Jenny - who has a four-year-old son Caspar from her former relationship with ex-fiance DJ Dominic Thrupp - is expecting her first kids with husband Vicente Juan Spiteri, a Spanish scuba diving school owner she married in Ibiza in August last year.
The couple tied the knot in a 10-minute ceremony, which was held in both Spanish and English in the grounds of the couple`s seven-bedroom home, and despite arriving to her nuptials 40 minutes late, the Atomic Kitten singer later admitted the day was perfect.
She said: "It was exactly how I wanted it to be. We couldn`t have asked for anything more, it was perfect from beginning to end."
The news of her pregnancy comes after she revealed in May that talks were ongoing about a possible Atomic Kitten reunion, but Jenny admitted she wouldn`t return to the band if Kerry Katona - who she replaced when she joined the girl group, which also features Liz McClarnon and Natasha Hamilton, in 2001 - was also part of it.
She explained: "I don`t want to be derogatory about Kerry but there shouldn`t be four of us in Atomic Kitten. When we do anything, it will be the three of us."