The newly-promoted club have confirmed that the Wales defender has moved back to London and signed a four-year deal at Upton Park
As exclusively revealed by Goal.com on Tuesday, Collins has returned to his former club after becoming surplus to requirements at Villa Park and the 28-year-old is delighted with the move.
"It's great to be back," he told West Ham TV. "Obviously having been here before and coming back and seeing some of the same old faces is great.
"As soon as I knew the interest was there from West Ham I couldn't wait to get down and sign. I had a great affinity with the club and the fans when I was here the first time and I enjoyed my time here so much last time that it wasn't a hard decision to make, to be honest.
"I think everyone knew that I didn't really want to leave when I did [in 2009] because I was enjoying my time here so much. I've come back and I'm a much better player this time around so I can't wait to get cracking and show the fans that I am a better player and can put in the performances on the pitch.
"I've got so many good memories - getting into the FA Cup final in my first season and finishing so high [ninth] in the league and then the way we escaped relegation that year was one of my fondest memories in football. Hopefully I won't have too many more memories like that!
"I just cannot wait to get back and show the fans what a better player I am now."