John Cena Shares Marriage Advice After Celebrating 3-Year Anniversary With Wife Shay Shariatzadeh

John Cena chats with ET's Cassie DiLaura at the Los Angeles premiere for 'The Iron Claw,' in theaters on Dec. 22. The actor shares marriage advice after celebrating his 3-year anniversary with his wife, Shay Shariatzadeh. Plus, he recalls his experience working with Zac Efron on the upcoming film, 'Ricky Stanicky,' and opens up about why he thinks Zac is an 'incredible person.'