Blake Lively reveals pregnancy at premiere of Ryan Reynold's film Detective Pikachu

Blake Lively arrived at the premiere of husband Ryan Reynolds' new film with a surprise announcement - she's expecting the couple's third child.

The Simple Favor star wore a yellow dress in keeping with the theme of the film, Pokémon: Detective Pikachu, which showed off her prominent baby bump.

NEW YORK, NEW YORK - MAY 02: Blake Lively and Ryan Reynolds attend the 'Pokeman Detective Pikachu' U.S. Premiere at Times Square on May 02, 2019 in New York City. (Photo by Michael Stewart/FilmMagic)
Photo credit: Getty

Lively had clearly been keeping her pregnancy under wraps for some time, briefly posing for photographers before heading inside with Reynolds to watch the film.

The Hollywood power couple have two daughters, Inez, 2, and James, 4. Earlier this week, Reynolds said his eldest daughter was excited to see  Pokémon: Detective Pikachu.

"My daughter James is losing her mind over it," he told Entertainment Tonight.

"She's never been interested in a movie I've done ever."

Exactly how far along Lively is remains to be seen.

After the birth of their second child, Reynolds revealed that he had opted to play Marvin Gaye's 'Let's Get It On' in the delivery room.

"It was like steak knives came out of her eyes," Reynolds told Seth Meyers of his wife.

"She was like, 'Are you f**king kidding me right now?!'"

The couple have been married since 2012.