Surprise! Michael Sheen Expecting First Child with His Much Younger GF

Actor Michael Sheen is going to be a dad for the second time!

Sheen, 50, is expecting a child with new girlfriend Anna Lundberg, 25. On Wednesday, Sheen made the big announcement, tweeting, “Very happy to let everyone know that my partner Anna and I are expecting a little angel of our own. (Just to be clear - we're having a baby!) #nottheantichrist.”

It was the first time that he acknowledged his new girlfriend, who has been posting about the romance for the past few months.

Though her Instagram is private, Lundberg has shared several pics of Michael. In one photo, Michael and Anna are seen looking lovingly into each other's eyes at the London premiere of his show “Good Omens” in May. According to DailyMail.com, she wrote, “What an incredible night to be a part of! Again I'm overwhelmed with pride and couldn't be happier for Michael & the cast.”

She also shared a PDA photo of them holding hands as they sat in their seats at the premiere.

Earlier in May, Anna posted a selfie with Michael from the NYC screening of the miniseries.

The pair recently enjoyed a vacation in West Wales. She took to her Instagram Story to post a video of him making her laugh with some bug spray.

According to her website, Anna completed a three-year theatre program in Sweden, summer courses at the London Academy of Music and Dramatic Art (LAMDA) and Guildford School of Acting in England, and a two-year conservatory program at the American Academy of Dramatic Arts in New York. She recently wrapped up her one-year at the New York Academy Company, which had her playing Desdemonia in Shakespeare's “Othello” and Frau Gabor in “Spring Awakening.”

Sheen is also the father of Lily, 20, his daughter with ex Kate Beckinsale.

Sheen and Beckinsale have remained friends since the split. A few years ago, Kate opened up about spending the holidays with Michael and his then-girlfriend Sarah Silverman. She told "Extra" while promoting the "Underworld" franchise, "I quite often go back to the UK for the holidays, but this time, I've been traveling so much, you know, with various work things, that I brought the UK to me, so I'll have my… my family here and my daughter's dad [Sheen] and his girlfriend [Sarah Silverman] will be here and it will be fun.”