Photos: Margot Robbie and Greta Gerwig steal the show at Oscar luncheon

The casts of 'Barbie' and 'Oppenheimer' gathered Monday at the annual Academy Award nominees luncheon alongside dozens of less famous and first-time Oscar hopefuls for handshakes, hugs, a huge group picture and instructions on nailing an acceptance speech.

Greta Gerwig and Margot Robbie, whose snubs for best director and best actress, respectively, for 'Barbie' caused a major stir, both showed up for the nominations they did get, and were all smiles. Gerwig, nominated for adapted screenplay, was surrounded by selfie-seekers as soon as she entered the banquet hall.

Margot Robbie, up for best picture as a 'Barbie' producer, beamed nearby as she chatted with other nominees. Gerwig and Robbie got some of the loudest cheers of the afternoon when their names were called during the class picture roll call that feels like a school commencement and is perhaps the day's most egalitarian tradition. The names are read and nominees called up to risers in an order that seems to make no accounting for fame.

The luncheon dress code is daytime casual. For Gosling that meant a lilac suit with matching shirt, for Robbie a light pink beaded business suit with a bared midriff.

Martin Scorsese, 81, nominated this year for best director on 'Killers of the Flower Moon,' may have gotten the loudest ovation of the day when he was called up. He is seen here with Da'Vine Joy Randolph.

Christopher Nolan, whose film, 'Oppenheimer' notched up 13 nominations, including Best Director, attended the event with wife Emma THomas, who produced the film.

'Oppenheimer' cast Robert Downey Jr, Emily Blunt and Cillian Murphy pose for a picture. Murphy is a favorite for best actor for his role as Oppenheimer, father of the atom bomb.

Carey Mulligan, nominated as best actress for 'Maestro,' was dressed in an all-black ensemble.

Colman Domingo brought in a bit of evening with a tailed black jacket, black shirt with a plunging neckline and white slacks.

Lily Gladstone looked gorgeous in white and was singled out for a handshake by Christopher Nolan during the group photo.

And, finally, the star of the show was Messi, the dog that played Snoop in 'Anatomy of a Fall.' The canine travelled all the way from France to be at the luncheon at Los Angles. It got special treatment from the likes of Gosling and Bradley Cooper.