Washington, Sept 6 : Beyonce Knowles, who recently turned 30, invited close friend Gwyneth Paltrow to celebrate her birthday on board a luxury yacht in Venice, Italy.

Beyonce, who touched the milestone year on September 4, is currently staying on the yacht with husband Jay Z, Contactmusic reported.

Paltrow, who is in the Italian city promoting her new movie `Contagion' alongside Matt Damon, was invited to join them on the yacht.

The `Single Ladies (Put A Ring On It)' hitmaker, who is pregnant with her first child, was also spotted soaking up the sun on the top deck of the boat. (ANI)