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"I Do"-uet
"I Do"-uetYellowstone's Hassie Harrison and Ryan Bingham are deep in the throes of newlywed bliss ... with the actress now proudly taking her wedding ring out for a spin.
Video footage shows Hassie flashing her rock at the Wynn Hotel in Vegas ... at a fun-fueled after-party for Ryan following his performance at the city's Virgin Hotel Thursday.
The newlyweds are filmed singing one of Ryan's new, unreleased songs ... which sources at the bash tell TMZ he wrote for her and requested she come up on stage to sing it together.
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