Rajeev Masand spoke to Amitabh Bachchan on his show and brought up his guest-appearance in the film English Vinglish.
From 7.22 on on the clip here.
Rajeev Masand: "Mr Bachchan I met Sridevi recently who's just completed her first film in 15 years, English Vinglish, I know you have a cameo in the film and I asked her about it. And she said that working with you was like meeting an old friend after many years. Is that what it felt like?
Amitabh Bachchan: Yes of course. We've done several films together. And Balki just wanted me to walk in and walk out. So I did that. She's always been a fantastic artist and still is."