Britney Spears had two surprise guests during a recent show in Croatia: Her sons!

Sean Preston, 6, and Jayden James, 5, joined their famous mom on stage over the weekend during her Femme Fatale show at Arena Zagreb.

The adorable tots popped up after her finale performance of "Till the World Ends," holding hands with Britney and waving at the crowd.

What a cute family!

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