The full team is:
Leigh Halfpenny; Alex Cuthbert, Jonathan Davies, Jamie Roberts, George North; Rhys Priestland, Mike Phillips; Paul James, Matthew Rees, Aaron Jarvis, Bradley Davies, Luke Charteris, Ryan Jones, Sam Warburton (captain), Toby Faletau.
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Sun and showers this afternoon with patchy frost on the way this evening.
Plaid have been handed an election boost as influential Labour supporters urge people to pick the Welsh nationalists on regional ballots.
A record crowd of more than 66,000 is expected at the Principality Stadium today for the back-to-back Welsh derbies.