Miller – who infamously blew his chance t o fight AnthonyJoshua after his 2019 doping scandal – has earned the nickname Big Baby over the years.
For his last bout against Daniel Dubois in December he weighed 23 STONE.
But in recent pictures circulating online, Miller appears to have dramatically transformed his body.
The controversial American, 36, flexed a trimmer chest and midsection just two weeks out from his bout with Ruiz.
Miller actually gave Ruiz the chance to beat AJ for the world titles after his drugs bust.
He blamed the failed tests on a tainted supplement and stem cell shots in his elbow.
He then received a contract with Bob Arum’s Top Rank stable but again tested positive for a banned substance.
This time the ex-kickboxer put it down to a SEX PILL and was handed a two-year suspension.
Miller actually gave Ruiz the chance to beat AJ for the world titles after his drugs bust.
He blamed the failed tests on a tainted supplement and stem cell shots in his elbow.
He then received a contract with Bob Arum’s Top Rank stable but again tested positive for a banned substance.
This time the ex-kickboxer put it down to a SEX PILL and was handed a two-year suspension.
The Mexican-American stunned Joshua, 34, in June 2019 but lost the rematch on points six years later.
He beat Chris Arreola, 43, and Luis Ortiz, 45, but has faced a spell on the sidelines as promoter Eddie Hearn predicted a tough bout with Miller.
Hearn told Matchroom Boxing: “I actually think this is a really tough fight for Andy Ruiz. It’s going to be all actions
.“Jarrell Miller is always going to be on the front foot, always comes to fight, and Andy is a very sharp counter-puncher as well, but he’s been out of the ring for a long time. “There’s going to be huge support for him in Los Angeles, but he better have hunger in his belly for this fight because otherwise, he’ll get overrun by Jarrell Miller.”
