CBS broadcaster Tony Romo made another marriage mistake about Travis Kelce and Taylor Swift on Sunday.

Viewers were left wondering whether the commentator knew something, or if he was just rolling with a long-running joke.

Romo was on the call with Jim Nantz for Sunday’s showdown between the Buffalo Bills and Kansas City Chiefs.

Tight end Kelce was the star of the show with two touchdowns as the Chiefs booked their spot in the AFC Championship Game.

Kelce, 34, was watched by his girlfriend Swift while brother Jason was also in attendance.

Eagles star Jason ripped his shirt off and watched on topless while sat just behind the music megastar.

CBS cameras cut to Swift celebrating with Patrick Mahomes’ wife Brittany after his touchdown early in the third quarter.

The pair were hugging and wore beaming smiles on their face while topless Jason was sat just behind.

And Romo laughed: “There’s your brother-in-law right behind you.”

Former Dallas Cowboys quarterback Romo has often prematurely referred to Swift and Kelce as husband and wife.

The pair only went official in October after months of dating rumors.

One fan said: “That’s at least the 3rd time this season I’ve heard Romo say they were married.

“Maybe he knows something we don’t and Travis and Taylor already got married.”

Another commented: “He’s referred to swift as Kelce’s wife several games now.”

A third wrote: “I think it’s a ‘joke’ now as he said they were married in an earlier game.”

Kelce was seen waving goodbye at Bills fans in the closing stages of Sunday’s game.

Tyler Bass missed a 44-yard field goal to tie the game and Bills fans were seen headed for the exit.

And tight end Kelce game them a wave as they poured out of Highmark Stadium and the Chiefs booked a trip to M&T Bank Stadium to take on the Baltimore Ravens.