The 'Toxic' hitmaker has been at the centre of speculation, suggesting she ended her relationship with Lucado last month.
Spears, 32, refused to comment on the gossip, but set the record straight by sharing an intimate snap of herself posing with her partner on Facebook.
The image shows Spears wearing a snorkeling mask and smiling for the camera alongside a topless Lucado.
She captioned the picture: "Hola from Spears Beach aka mi casa (my home).