Billy Baldwin is "excited" about his niece Hailey Bieber's pregnancy

He told People magazine at the 'Americans With No Address' VIP screening in Los Angeles: "I really feel like there's no higher calling than that responsibility.

"I just found out a couple of hours ago.

"My niece and nephew [were asking], 'Have you talked to Stephen [Baldwin] yet? Been able' - No, I haven't. I just texted him.

"But this will be his second [grandchild] and I'm excited."

The 61-year-old actor thinks Justin, 30, and Hailey - who married in 2018 - are an "adorable" couple.

He added: "I think they're an adorable couple. Hailey comes from a great family with my brother Stephen and his wife Kennya and her older sister Alaia, who's married with her own grandchild."

The 'Backdraft' actor - who has Jameson, 24, Vance, 23, and Brooke, 20, with wife Chynna Phillips - shared his "greatest regrets" about raising his own children.

He said: "I was a little bit too new age, and I wasn't old school enough."

The 'Peaches' singer and wife Hailey announced their baby news with a montage on Instagram, which featured the pair renewing their wedding vows in Hawaii.

Among a series of behind-the-scenes snaps, Hailey is seen wearing a white, lace dress that highlights her baby bump while Justin takes a photo of his wife.

The 'Love Yourself' hitmaker's mom, Pattie Mallette, has shared her excitement about becoming a grandmother.

She said in a video shared to Instagram: "So I have been waiting for this day and now that they have shared it I can finally celebrate with ya'll.

"Oh my gosh, I'm going to be a grandma. Oh my goodness!

"Justin and Hailey you are going to be the best parents ever and I am so excited. Oh my goodness. Praise God."

Pattie, 49, also dec lared her heart to be "so full" due to the news.

She captioned her post: "BABY BIEBER IS ON THE WAY!! I'm gonna be a GRANDMA!! CONGRATULATIONS @justinbieber and @haileybieber !! My heart is so full. What an exciting new adventure. Love you so much!(sic)"