The couple, who have been officially dating for several months, confirmed their happy baby news earlier today.
In a statement released by Dan's management, he said: “We are thrilled by our news. Becoming a fatherhas been the most amazing thing to ever happen to me. I can’t believe I’m going to be a Dad again – I’m truly blessed.”
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****An insider reveals: “It wasn't planned but they're really happy. They love each other very much and Dan is really excited about being a dad again."
Dan, 23, is also dad to 9-month-old son Teddy by his ex-girlfriend, Megan Tomlin.
Speaking t**o heat magazine **earlier this month, Dan spoke about his adoration for his adorable baby son.
“Having Teddy changed my perspective, he makes me want to do better, and be better," he said.
“I want him to be proud of me when he goes it. I’ll make sure he has everything he ever needs. Having a baby really changes the way you think about everything.”
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The new baby will be 22-year-old Jacqueline's first child.