This weekend's other new wide release — Paramount's horror story "The Ruins," about tourists who discover an ancient evil during a jungle trip — debuted at No. 5 with $7.8 million.

In narrower release, Martin Scorsese's Rolling Stones concert film "Shine a Light," distributed by Paramount Vantage, did fair business with $1.5 million.

Wong Kar Wai's romantic drama "My Blueberry Nights," starring singer Norah Jones and Jude Law, Rachel Weisz, Natalie Portman and David Strathairn, took in a solid $73,742 opening in six theaters.

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, according to Media By Numbers LLC.

1. "21," $15.1 million.

2. "Leatherheads," $13.5 million.

3. "Nim's Island," $13.3 million.

4. "Dr. Seuss' Horton Hears a Who!", $9.1 million.

5. "The Ruins," $7.8 million.

6. "Superhero Movie," $5.4 million.

7. "Tyler Perry's Meet the Browns," $3.51 million.

8. "Drillbit Taylor," $3.5 million.

9. "Shutter," $2.9 million.

10. "10,000 B.C.", $2.8 million.