The High School Musical star first met the veteran Hollywood actress when they worked together on 2007 musical Hairspray, and he jumped at the chance to co-star with her in their 2011 comedy.
He has previously told how their onscreen smooch was his most favourite part of the shoot - and now he's confessed getting passionate with Pfeiffer had been his dream for years.
Efron tells U.K. talk show host Graham Norton, "I had a huge crush on Michelle during filming of Hairspray. She was an angel that turned up on set every day and I would try as much as I could to get close to her and strike up some awkward conversation - I was 18 and didn't know what I was doing.
"And then she was trying to get hold of me to see if I was doing New Year's Eve so I had two voicemails from Michelle Pfeiffer. It was the best experience of my life doing that movie with her. Driving around on a Vespa with her on the back, I felt like the king of the world. And kissing her was my dream come true. It was amazing."