Ghislaine Maxwell and Elizabeth Holmes have reportedly become inseparable in prison, forming an unexpected bond at Federal Prison Camp Bryan that's sparking controversy and headlines.

Elizabeth Holmes, the convicted Theranos founder, was caught on camera recently working out at a minimum-security prison in Texas where Ghislaine Maxwell was transferred.

The pairing of two of America's most notorious white-collar female inmates has reignited interest in the lives of high-profile prisoners.