Saif Ali Khan, who will again be seen onscreen with Katrina Kaif in "Phantom", said he is very fond of his co-star and that any person would be lucky to have her as a girlfriend, fiancee or more."I think Katrina is one of the most lovely girls I've worked with. And anybody would be lucky to have her as girlfriend, fiancee or in the future something more," he told reporters at the trailer launch of their upcoming action film directed by Kabir Khan and produced by Sajid Nadiadwala .Saif, who also did "Race" with Katrina, termed her: "One of the most beautiful and biggest stars in Bollywood.""I've known Katrina for a while. I've watched her from being a relatively new actor in 'Race' to becoming one of the biggest stars in the country, working very hard and becoming an amazing personality on screen. It's always nice to spend time with her. She is extremely relaxed and is someone who I've enjoyed talking to and working with. I think we had an easy equation, " he said.Saif is returning to action two years after "Bullet Raja" and according to him, it is a dream situation to feature in a film like "Phantom". "I love this kind of movies. To get a chance to work with Kabir and having Sajid as producer has given me a dream situation."The film, based on the theme of terrorism, is gearing up for release on August 28.