The Manchester band confirmed plans to record new material and embark on a tour earlier today.
The Beady Eye frontman tweeted: "[The] Stone Roses getting back together not been this happy since my kids were born... LG. (sic)"
Gallagher had previously spoken about his hope of a Stone Roses reunion, saying: "I'd love the Roses to get back, play that album and make a s**tload of money for themselves, because I'm sure they didn't make that much [before]. Do some great f**king gigs, see what the reaction is and go make a new record."
Mark Ronson also praised the reunion, tweeting: "The Stone Roses reuniting is a bigger deal than Led Zeppelin. Strictly for the fact of how improbable it seemed until today."
Reverend and the Makers' Jon McClure wrote: "Right today I'm going to listen to solid Biggie Smalls and The Stone Roses in the studio and have myself a little party."
The Stone Roses will play two dates at Manchester's Heaton Park on June 29 and 30 before embarking on a world tour.
Tickets for the reunion gigs will go on sale on Friday, October 21 at 9.30am.
> The Stone Roses reunion: In their own words
> The Stone Roses: Career in pictures
Watch the video for 'Love Spreads' by The Stone Roses below: