The happy couple debuted her baby bump at the Jupiter Ascending premiere in Los Angeles on Monday.
"The Porter family always loves supporting friends like @channingtatum and #TheWachowskis. #JupiterAscending," he posted on Instagram alongside this picture of him holding his wife's belly.
The former Friday Night Lights star actually met Mayfield, a casting director, during a game of beer pong, People reports. The two tied the knot in Texas in April 2013 while surrounded by his former FNL cast-mates.