Valtteri Bottas will join Pastor Maldonado in Williams' race line-up for the 2013 season

Williams have announced that Valtteri Bottas will replace Bruno Senna as Pastor Maldonado's team-mate in 2013.

How the 2013 grid is shaping up
Red Bull: Sebastian Vettel and Mark Webber.
McLaren: Jenson Button and Sergio Perez.
Ferrari: Fernando Alonso and Felipe Massa.
Mercedes: Lewis Hamilton and Nico Rosberg
Lotus: Kimi Raikkonen & TBC.
Force India: TBC.
Sauber: Nico Hulkenberg and Esteban Gutierrez.
Toro Rosso: Daniel Ricciardo and Jean-Eric Vergne.
Williams: Pastor Maldonado and Valtteri Bottas.
Caterham: Charles Pic & TBC.
Marussia: Timo Glock and TBC
HRT: TBC.