Julia Roberts dons dotted LBD and embraces onscreen son Lucas Hedges at Ben Is Back premiere in NYC

Oscar winner Julia Roberts flashed her famous mega-watt grin as she embraced her onscreen son Lucas Hedges at the New York premiere of their film Ben Is Back on Monday night. 

The Oscar nominee - turning 22 next week - gave the 51-year-old mother-of-three a big bear hug as they reunited to promote the family drama at AMC Loews Lincoln Square 13.

'He was at our house a lot. He was there for Thanksgiving. He came to soccer games,' the Georgia-born belle told Extra on Monday of their pre-filming bonding.  

'He went to the beach with [my twins Hazel & Phinnaeus, nearly 14; and son Henry, 11], and did things so that we were part of each other's lives before we started to pretend to be the most important people in each other's lives.'

In Ben Is Back - hitting US theaters Friday - Roberts play drug addict Ben Burns' concerned mother Holly. who will do 'anything' to help him.

'Oh, anything!' the self-described soccer mom said of helping her own children.

'I mean, that is the universal connective tissue of mothers and mother figures in the world. There is nothing you would not do to help, save, support, hold your child close.'  

Lucas found it 'weird' to be directed by his father Peter (The Odd Life of Timothy Green, Dan in Real Life), but shrugged: 'My dad wrote an amazing, amazing story.'

For the red carpet, the three-time Golden Globe winner looked slim in a single-strapped dotted LBD, patent leather pumps, and a white maxi-coat selected by stylist Elizabeth Stewart.

Hairstylist Serge Normant coiffed Julia's blonde wavy updo for the glitzy event. 

And make-up artist Genevieve Herr applied Roberts' smoky eye and dark brows. 

The Homecoming actress - who's married to Ibiza DP Danny Moder - also posed with her onscreen husband Courtney B. Vance and their onscreen children Jakari Fraser and Mia Fowler.

The 58-year-old Harvard grad - who's really married to Angela Bassett - plays Neal Burns, who tries to remain patient and understanding in the Christmas Eve flick.

Missing from the Georgia State University drop-out's faux family portrait was 21-year-old Kathryn Newton, who plays Holly's daughter Ivy.

Eight-year-old Jakari looked dapper in his tiny metallic Appaman tuxedo and Florsheim patent leather dress shoes.

Julia also excitedly greeted Rachel Bay Jones, who plays her complicated character's deceased ex-girlfriend Beth Conyers.

The 49-year-old Tony winner (Dear Evan Hansen) looked flashy in a gold sparkly pantsuit selected by styling team RRR Creative.

Hedges was likely not thrilled that David Zaldivar - who plays Spencer 'Spider' Webbs - wore a nearly identical grey suit with black turtleneck and black dress shoes.  

The Royals' Alexandra Park - who plays Cara K - took the plunge in a strapless black Finders Keepers dress and matching booties.

Girls alum Zosia Mamet rocked a black zip-up mini-dress with fishnet socks and peep-toe platforms selected by her one-man glam squad, Joshua Ristaino.

The 30-year-old daughter of playwright David Mamet will next play Troy in David Robert Mitchell's dramedy Under the Silver Lake, which hits US theaters April 19.