This movie is in color, English, USA made.
It is likely from 5-10 years ago. Maybe a comedy or romcom.

The scene I remember:
A young woman shows up to a party to which she had been invited. Someone is with her–a date or a friend. The party-goers enter through the front door. The party is in an expensive modern house, or maybe a large apartment. It’s a dancing type of party. Like a fancy nightclub. The woman has brought something with her–maybe cookies on a plate covered in tinfoil or a casserole in a glass pan. She brought the food because her mother told her never to show up to a party empty-handed. (I don’t know when this was talked about–maybe it was repeated during the movie.) The party hostess is a bit surprised/confused, but very polite and takes the dish and welcomes the friends.
The woman arriving at the party might be Anne Hathaway, but I haven’t tracked down the movie/scene yet, so I could be wrong–maybe way off on that.
Thank you for anyone who can help!