Maksim Chmerkovskiy and Karina Smirnoff

Dancing with the Stars pros Maksim Chmerkovskiy and Karina Smirnoff have called off their engagement, a source close to the couple confirms to

The split, first reported by E!, comes a day after Chmerkovskiy cryptically tweeted: "What was meant to be a 'life long book', turned into a 'chapter'.......and now that 'chapter' is finished...... Se la vie..."

See who else has split this year

Longtime friends, the dancers have been engaged since New Year's Eve and had been planning a June 2010 wedding, Chmerkovskiy previously told They had delayed their nuptials to accommodate their busy careers, which included stints on Broadway's Burn the Floor this summer.

News: Maks: I'm happy to be with Debi Mazar — and not Joanna Krupa

Both will be on the new season of Dancing, which premieres Sept. 21. Smirnoff is paired with Aaron Carter, while Chmerkovskiy will hit the floor with Debi Mazar.