Last week, it was reported that Katrina Kaif had spent a quiet evening with her Ajab Prem Ki Ghazab Kahaani co-star Ranbir Kapoor and his family. Now, Kat's been spotted partying with ex-boyfriend Salman Khan's's sisters, Arpita and Alvira, on Thursday night. Salman's li'l sister posted this picture on social networking site Twitter and wrote: Girls@ Mohammed Ali rd!" Also seen in the picure is Indian Idol 6 host Mini Mathur, who is married to Ek Tha Tiger director Kabir Khan.