'Succession' star Brian Cox declares he's a 'closet Spice Girls fan' and sings along to 'Wannabe' on 'Carpool Karaoke'

• "Succession" star Brian Cox has admitted that he's a "closet Spice Girls fan."
• The Logan Roy actor appears in an upcoming episode of "Carpool Karaoke."
• The teaser shows him singing "Wannabe" with actor Alan Cumming.

Scottish actor Brian Cox is best known for playing wealthy businessman Logan Roy in HBO's "Succession," in which he tells his equally rich children to "fuck off" at least once an episode. 

The show revolves around the fact that his character is past his prime, and it's time for one of his kids to take over his media empire — however, which child Daddy Roy likes the most seems to change week by week.

As well as "Succession," Cox is set to appear on an upcoming episode of "Carpool Karaoke: The Series" on Apple TV+ alongside fellow Scotsman, Alan Cumming.

Although Cox has had plenty of success after starring in huge movies like "Manhunter," "The Bourne Identity," and "Troy," he said that there's one project of Cumming's that he's particularly jealous of: "Spice World."

Oh, yes, Cox is secretly a Spice Girls fan. 

In a preview clip from the March 31 episode, Cox can be seen telling Cumming: "Now you see, there's one thing I am mainly quite envious of what you've done… Well, the Spice Girls movie.'"

Fans might remember that Cumming played Piers Cuthbertson-Smyth, a director who wants to make a documentary about the group, in the 1997 movie.

Cox goes on to admit, "I am a closet Spice Girls fan," before he and Cumming sing the group's classic track "Wannabe" together.

In the clip, the "Succession" star also says that he's really enjoying the fact that his character is so foul-mouthed in the critically acclaimed series.

"I've been at it now for 60 years. Suddenly to have this extraordinary success telling people to fuck off, and actually, yeah, I love it," Cox says.