The 17-year-old from North Carolina took home the prize after a record-breaking total of 122.4 million votes from American Idol fans were recorded.
Beyoncé, Lady GaGa, U2 and American Idol judge Steven Tyler were among the stars who also took to the stage during the two-hour show, which aired live from the Nokia Theater in Los Angeles. Former American Idol contestants were also in attendance.
Here's a round-up of what some of the alums have been saying about the guest performances and result on Twitter:
David Cook (season 7)
"Congrats to @AmericanIdol on another year in the books and congrats to Scotty and the rest of the TOP 13 on an amazing season!"
David Archuleta (season 7)
"What an awesome night it was!! Congrats to Scotty, and to Lauren as well for their amazing run and continued success."
Ruben Studdard (season 2)
"@smccreeryAI10 Congrats brother. God bless your career!!!"
Chris Daughtry (season 5)
"Yeah Steven Tyler and the DeLeo bros!!!!!... My boy @Martihfred on drums with Steven!!!!
Taylor Hicks (season 5)
"Congrats! Scotty! AI10!"
Jason Castro (season 7)
"Congrats @SMcCreeryAI10!! What a great ending to a great season."
Kris Allen (season 8)
"Can't believe I just watched Bono and the Edge perform live. Uh....mazeballs!... Great time at the finale tonight. Congrats Scotty and the rest of the idols on starting their career tomorrow."
Adam Lambert (season 8)
"Some amaaaazing performances at Idol tonight!!... I met Jack Black!!! Such a fan! Beyonce and Gaga's performances were awesome!!! Oh and Steven Tyler!!! Hot!"
Allison Iraheta (season 8)
"conngras scott and lauren!!!"
Pia Toscano (season 10)
"Highlight of my life.. Performing with Beyonce!! Congrats @SMcCreeryAI10 and @LAlainaAI10!! You are both stars and I couldn't be more proud."
Diana DeGarmo (season 3)
"Congrats to Scotty on being crowned the new @AmericanIdol but I'm still sending love to my hometown girl @LAlainaAI10!"
Brooke White (season 7)
"Haven't gotten to watch the @AmericanIdol finale yet but I heard the news... Congrats Scotty! Happy for Lauren too, both so cute & talented!"
American Idol airs on Fox.
More on the American Idol season finale:
> American Idol recap: The finale performances
> Lauren Alaina loses voice before 'Idol' final
> American Idol finale performance night: Pictures
> American Idol attracts record-breaking votes
> Poll result: Who should win American Idol?
> Read our American Idol news, recaps and features
Watch Scotty McCreery performing 'I Love You This Big' below: