Helen Mirren looks like she's got deep mob ties to Tom Hardy ... because she's showing support for her "MobLand" co-star amid reports of tensions on set.

Helen posted a photo of Tom on social media Thursday and wrote, "Love you now and always."

The public show of support comes on the heels of a report that Tom was difficult to work with on Season 2 of the Paramount+ hit ... he was allegedly holed up in his trailer and kept Helen, Pierce Brosnan, and the rest of the cast and crew waiting.

Sounds like Helen's got no issues with him though.

Tom's also at the center of rumors he's been fired from the show ... but as we first told you, Paramount has yet to officially renew "MobLand" for a third season ... so that might all be moot.