The 30-year-old adopted daughter of Mia Farrow and Woody Allen made the announcement as she attended TIME’s 100 Gala on Tuesday night (26Apr16). Dylan couldn't hide her blossoming bump as she wore a strapless grey beaded gown while posing with her mother at the event.

She also revealed she's expecting a daughter, with her due date coming this fall.

However, she refused to be drawn on what moniker she and her husband have chosen for the tot.

“I picked a name, but my husband would kill me if I told you,” Dylan told People. “He wants it to be a secret."

While this is the first child for Dylan, it will be Mia's tenth grandchild. But the 71-year-old actress is feeling more than a little joyful about the prospect of another new arrival.

“I have nine grandchildren, but I’m excited about this one,” Mia added to People. “So is her husband.”

Mia was at the gala as an alumni of TIME’s 100 Most Influential People list. It's her third consecutive year of attending the star-studded bash.

Dylan hit headlines back in 2014 when she penned an open letter for the New York Times newspaper alleging that she had been sexually abused by her adoptive father Woody when she was just seven years old.

The movie director strenuously denied the allegations and claimed the allegations had been orchestrated by Mia as a "smear" against him.

"Not that I doubt Dylan hasn't come to believe she's been molested," he wrote in a letter to the publication. "But if from the age of 7 a vulnerable child is taught by a strong mother to hate her father because he is a monster who abused her, is it so inconceivable that after many years of this indoctrination the image of me Mia wanted to establish had taken root?

"Of course, I did not molest Dylan. I loved her and hope one day she will grasp how she has been cheated out of having a loving father and exploited by a mother more interested in her own festering anger than her daughter's well-being."