TMZ broke the story ... Tom and Irina spent the entire weekend together in Los Angeles and are now officially dating, after first meeting at a billionaire's wedding where several models were hitting on Tom.
Some of our other sources say Gisele is "not happy" about the Tom and Irina news ... but now, people close to GB are pushing back.
For her part, Gisele has been spending a lot of time with her jiu-jitsu instructor in the wake of her and Tom's divorce ... though people close to her have consistently said she's not dating Joaquim Valente.
So, Tom's the first to officially move on ... and Gisele is rolling with it.
We covered it all in the latest episode of The TMZ Podcast, available on all podcast platforms.