Stooshe, Crystal Fighters and Delilah have also been added to the bill of the music event, which takes place in London's Victoria Park between June 15 and 17.
Dot Rotten, Dev, Devlin and Saint Saviour also join the lineup, which features headline acts Hot Chip, Friendly Fires and Grace Jones.
Ora said of the festival: "I'm really excited to be performing at Lovebox this summer and celebrating the 10-year anniversary alongside some incredible artists."
Maverick Sabre added: "I'm really looking forward to performing at Lovebox 2012. Last time was crazy and I'm sure this year will be even better seeing as it's the big 10-year anniversary."
Lana Del Rey, Emeli Sandé, Chic, Niki & The Dove, Kelis, Sam Sparro and Madeon are among the other acts previously confirmed to play Lovebox 2012.
Tickets for the festival are on sale now.
Watch the music video for Stooshe's new single 'Black Heart' below: