Last Memorial Day weekend another animated flick led the charts, Disney-Pixar’s Up. In the era of 2010 however, the probable lesser-remembered Shrek Forever After is at numero uno with $55.7 million over the four-day break. With such varied flicks dropping last Friday (or Thursday), in particular Sex and the City 2 and Prince of Persia: The Sands of Time, it’s funny how no one seemed to care all too much. Not celebrate veteran memoriam with four aged cougars and noisy desert action? This is America, by God. Shrek’s total is up to $145.4 million in ten days, still a mighty step below preceding Shrek the Third, which at this point had $203.4 million in the bag. Ouch.

R-rated indulgence didn’t spread galore at the movies, but in regards to fans of the hit (and now cancelled) HBO original series, Sex and the City 2 wasn’t a complete disaster. Sure, Sex and the City opened to $57 million atop the charts in summer 2008. The sequel has already lapped up $79 million worldwide and $37.1 million domestic on a budget of $100 million, half of Prince of Persia’s, which debuted to $37.8 million in front of Sex. The Bruckheimer-produced blockbuster managed better critical reviews than City did (Persia: 40% on Rotten Tomatoes; Sex: 16%) but couldn’t overcome sloppy marketing tactics. Read more on that in our review of the film.

Iron Man 2 fell 21.9% to #4 with $20.6 million, total of $279.2 million so far. Trailing behind was Robin Hood with $13.6 million.

Out of the top five-

• Acclaimed crime comedy Micmacs, from co-writer-director Jeane-Pierre Jeunet of Oscar-nominated Amélie fame, opened to $56,700 at four sites.
• Historical play Agora rung up $43,200 at two sites.

Here are the box office results according to studio estimates Monday-

1. 1. Shrek Forever After…$55.7 million
2. 2. Prince of Persia: The Sands of Time…$37.8 million
3. 3. Sex and the City 2…$37.1 million
4. 4. Iron Man 2…$20.6 million
5. 5. Robin Hood…$13.6 million
6. 6. Letters to Juliet…$7.3 million
7. 7. Just Wright…$2.7 million
8. 8. Date Night…$2.3 million
9. 9. MacGruber…$1.9 million
10. 10. How to Train Your Dragon…$1.5 million