According to the BBC, Clint Eastwood's racial drama Gran Torino was in second place. The third spot was claimed by a new entry, horror film The Unborn, which made just over 1.3millon pounds.
Wrapping up the top five was Confessions of a Shopaholic.
UK and Ireland"s top five films:
1. Slumdog Millionaire - 1.7million pounds
2. Gran Torino - 1.35million pounds
3. The Unborn - 1.3million pounds
4. Bolt - 1.29million pounds
5. Confessions of a Shopaholic - 1.29million pounds