Tracey Heggins (Senna in BD2) talks about working with Rob and Kristen

CB: The film’s director, Bill Condon, said it brought out a very paternal and motherly part of Rob and Kristen on set —aside from their swearing! Would you agree?
TH: Yes, Mackenzie had a swear dish, so each swear was per dollar. Some people said, “I’ll give you 20 dollars now before we even start working.” So, she whooped us all into shape with our dirty mouths.

CB: What was it like working with stars like Robert and Kristen?
TH: It was good because they were both really down to earth. It’s very scary to go off on a set with huge names. I mean, when you are number one on IMDB, it’s a little intimidating. But they were just cool, and Kristen was like a tomboy and was so down to earth. Rob was the same way. He actually has this almost self-deprecating, ‘Oh, did I just say that?’ And I understand why he did that because it made everyone else feel so comfortable. So thank you, Robert!

CB: What was it like filming the last scene of the series? Were there any tears on set?
TH: Yes, especially when we went back to re-shoot. It was really like, ‘This is over now.’ That was really rough. You feel like a void when it’s all done. No matter how much is in the movie or not in the movie, we spent a lot of time together. Everyone from all the behind-the-scenes people and wardrobe, etc. make a set happen. I’ll be honest: we all got a little misty — even Rob and Kristen.

Source: thinkingofrob