Borussia Monchengladbach has completed the signing of Dutch striker
The move officially went through after weeks of negotiations between Gladbach and the Dutch club, and after the 21-year-old successfully passed a medical before signing on the dotted line.
De Jong found the back of the net 39 times in 75 appearances over the past two seasons for Twente.
"We are really delighted that this transfer has finally gone through," said Gladbach's director of sport
"Luuk will be able to travel with us into our training camp at Tegernsee on Friday."
De Jong joins a club which is embarking on its first season in the UEFA Champions League and his experience with Twente in that competition and the UEFA Europa League last season were important factors in his arrival.
Newly-promoted Hertha Berlin has strengthened its squad for next season's Bundesliga campaign by signing Japan midfielder Hajime Hosogai from Bayer Leverkusen for one million euros ($1.31 million).