Aww he loves his wifey so much!

Justin Timberlake showed his wife Jessica Biel some love on her 34th birthday -- or has he calls it, her "bae-day" -- aww!

BTW: did you know you that "bae" means "Before Anyone Else"?! Because we did ... umm ... totally!

In 2011, the singer gushed about her in an interview with Vanity Fiar saying, "She is the single-handedly most significant person in my life. In my 30 years, she is the most special person … I don't want to say much more, because I have to protect things that are dear to me – for instance, her."

Looks like he still feels the same way!

The two have been married since 2012, and have one 11-month-old son, Silas, together.