show pony

noun

1. informal.
   a person who tries to be the centre of attention; show-off

Example Sentences

“The last gallery I worked with referred to their artists as being in a stable,” the artist said, adding, “I am not a show pony.”

From New York Times

He has a fear of being an actor who is “this indulgent kind of show pony.”

From Los Angeles Times

A neglected horse which was abandoned and "left to die" on the side of a road in the Republic of Ireland is now a prize-winning show pony.

From BBC

"Lauren Boebert is an anti-American, anti-Colorado show pony who can't tell right from wrong," his campaign website says.

From Salon

“During his whole career, Biden’s always been a workhorse, not a show pony, right?”

From New York Times