Movies
Rex Features
It holds off competition from Abba musical Mamma Mia!, which spends its seventh week on the chart at number two.
Elsewhere, Vin Diesel's Babylon A.D enters at seven, while Bryan Bertino's horror The Strangers debuts at three.
The top ten in full:
1. (-) Step Brothers - £1,681,492
2. (2) Mamma Mia! - £1,548,894
3. (-) The Strangers - £1,250,624
4. (1) Hellboy II: The Golden Army - £1,025,449
5. (4) The Dark Knight - £908,618
6. (3) Get Smart - £710,174
7. (-) Babylon A.D. - £536,968
8. (5) You Don't Mess With The Zohan - £420,761
9. (7) Wild Child - £389,247
10. (8) WALL-E - £360,110
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