You're awfully lucky. Lovely little girl you have here.

5 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.

You can hear this line at 00:24:08 in the Blu-ray version of the movie.

Quote context

[...]

- Come in.

- They said you wanted to see me, Mrs. Walker.

- Come right in.

- Hello there. Good to see you again.

- It's nice to see you.

- You're awfully lucky. Lovely little girl you have here.

- Thank you, and Susan's the reason I asked you to drop down. She's a little confused. I thought you could help to straighten her out.

- I'll be glad to.

- Would you please tell her that you're not really Santa Claus, that there actually is no such person?

- I'm sorry to disagree with you. Not only is there such a person, but here I am to prove it.

[...]