Lively, who recently tied the knot with Reynolds in secret, said she enjoyed filming with the 75-year-old actor in 'The Private Lives of Pippa Lee', reported Marie Claire.
"Honestly, Alan Arkin was one of the best love interests I've ever had. He was the most kind, fun and a challenge - because he was clearly very uncomfortable with the fact that I was 19 and he was 72," said Lively.
The 25-year-old actress also recalled the moment she fulfilled a lifelong dream - to meet the Spice Girls.
"When I was a child I probably should have been medicated about my obsession with The Spice Girls. Recently, I was in London and I stayed in my hotel most of the time because it was raining. But on the last night I went out for dinner. After I'd arrived, I was told a bunch of paparazzi had showed up. I thought, 'that's so weird. I've been left alone most of my stay - why are they bothering me now?
"But then someone told me it was because Victoria Beckham was in the same restaurant. I was like, OK, that makes sense. She's a friend of mine and I would have said hello but I decided I didn't want to bother her. Until that person then told me that she was there with I was like, I need to say hello! So, there you have it; I got to hang out with The Spice Girls. It was my lifelong dream. That's it now. I can quit," said Lively.