The breathtaking Victoria's Secret angel was spotted stepping out with a ring on that finger, prompting many thinking that she and Bradley are engaged.
Onlookers noted that the ring "appears to be a gorgeous oval-cut emerald stone bordered by flawless diamonds."
Things are certainly getting serious between the pair, with Irina expecting her first child with her actor beau.
While neither have commented on the exciting news, a friend told E! News that Irina is due to give birth in May.
"Irina is feeling wonderful. She is so happy," they said.
"Bradley and her can't wait for their baby to arrive in the summer. They [also] know the sex of the baby."
The 30-year-old revealed her pregnancy while strutting her stuff down the Victoria's Secret runway, in Paris.
Irina may have concealed the bump will on the catwalk, but insiders revealed she proudly showed off her growing body at the after-party.
The baby has just made the couple even closer.
"Bradley's mother [Gloria Campano] and Irina are very close, and she has been really supportive," an insider dished to E! News. "
"She is ecstatic to be a grandma. She is a really kindhearted mom. They get along great—even when Bradley is working they hang out."
The model and Bradley, 41, have been dating since spring 2015. Irina was previously with soccer star Cristiano Ronaldo and Bradley dated British beauty Suki Waterhouse.
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Australian Women's WeeklyYesterday 5:55pm