'All Blacks' Rugby Star -- My Porn Star Ex-GF ... Is a Hall of Famer!

She famously dated one of the best rugby players in the world ... and now porn star Kaylani Lei is finally becoming a Hall of Famer in her own right ... TMZ Sports has learned.

Lei made international headlines back in 2005 when she hooked up with New Zealand All-Blacks superstar Byron Kelleher after reportedly meeting the guy at Hedonism sex resort in Jamaica.

In fact, one major British paper called them the raunchy version of Posh and Becks ... until they broke up in 2006.

After their relationship fizzled, Byron (now 38 years old) reportedly dated Princess Charlene of Monaco. He's now engaged to a hot European model Lilly de Vellis.

As for Kaylani -- who starred in classics like "Count Rakula," "Asian Fever 11" and "Yum Yum Dim Sum" -- she went on to win multiple XXX awards .... including Starlet of the Year (2005), Comeback of the Year (2008) and Best Group Sex Scene (2010).

Now, she's been selected for the AVN Hall of Fame ... and will be inducted with the 2015 class during the AVN Awards in January.

Congrats.