Ashton Kutcher may have more Twitter followers than Diddy and Russell Brand combined - but that achievement wasn’t reflected at the box office this weekend.

Despite pirating the first 13 minutes of Killers, Kutcher was unable to generate enough interest to earn more than third place. The film - Katherine Heigl’s first since leaving Grey’s Anatomy - only rounded up a mere $15.8 million. (In other words, Ashton got about $3 from each of his Tweeps.)

Meanwhile, Get Him to the Greek, starring Jonah Hill and Russell Brand (as his Forgetting Sarah Marshall character Aldous Snow), had audiences laughing to the tune of $17.5 million. The film - which also featured Sean Combs - had an opening on par with Marshall‘s debut in 2008. (That Nicholas Stoller film premiered to $17.7 million.)

Neither Killers or Greek, though, could conquer the reigning three-week champ. Shrek Forever After raised an additional $25.5 million to bring its domestic total to over $183 milllion.

1. Shrek Forever After, Paramount/Dreamworks, $25,486,465 (avg. $5811)
2. Get Him to the Greek, Universal, $17,570,955 (avg. $6515)
3. Killers, Lionsgate, $15,837,266 (avg. $5539)
4. Prince of Persia: The Sands of Time, Disney, $14,019,131 (avg. $3845)
5. Sex and the City 2, Warner Bros., $12,344,303 (avg. $3583)
6. Marmaduke, 20th Century Fox, $11,599,661 (avg. $3610)
7. Iron Man 2, Paramount, $7,918,708 (avg. $2633)
8. Splice, Warner Bros., $7,385,277 (avg. $3014)
9. Robin Hood, Universal, $5,366,940 (avg. $2065)
10. Letters to Juliet, Summit Entertainment, $3,036,367 (avg. $1548)

(You can review last week’s numbers here.)