Jolyon Palmer and Pascal Wehrlein are the latest drivers to be confirmed for the Race Of Champions.
Palmer, who will step up to a full Lotus race seat next year after spending 2015 as a reserve, and 2015 DTM Champion Wehrlein will join forces in the Team Young Stars in the Nations' Cup.
The duo also paired up in the same category at last year's event in Barbados.
"I'm delighted to be back at the Race of Champions this year," 2014 GP2 Champion Palmer said. "It was such a great event last year but as a Brit, being in London makes it even more special for me. It's always a fun event, with some good competition of course and I really hope the fans enjoy it."
Wehrlein, who acted as Mercedes' test driver this year and is reportedly set to race for Manor in 2016, is looking forward to capping off a great year with another victory.
"I'm really looking forward to coming back for my second Race of Champions," he said. "I enjoyed it so much last year in Barbados and I nearly made it all the way. Now I'll try to win it this year after my fantastic season winning the DTM title."
This year's Race Of Champions will take place at London's former Olympic Stadium on November 20-21 and Sebastian Vettel, Jenson Button, Felipe Massa, Daniel Ricciardo, and Romain Grosjean are some of the other drivers who have signed up.