The 'American Idol' judge showed the ultimate declaration of his love for the actress on US TV's 'The Jimmy Kimmel Show' where he unveiled his new inking during a performance to promote his latest album 'Fuse'.
Keith made sure no-one missed the romantic gesture by wearing a short sleeved top while he crooned away on his guitar.
The 45-year-old star already had the name of the actress etched onto his right arm in script font, but now sports a re-worked version of the tattoo featuring an additional Celtic design around the original inking.
The couple - who have been married for seven years - have two daughters together, five-year-old Sunday and three-year-old Faith. Nicole also has two adopted children, 18-year-old, Connor and 20-year-old Isobella, with her ex-husband Tom Cruise.
Nicole has previously said she'd love for one of her daughters to follow in Keith's footsteps and become a singer.
She said: ''[Sunday] has really good pitch. I'd love it if she sings. The great thing about being married to a musician is you have music in the house all the time. [Keith will] play the piano at 7 a.m. ... We have breakfast around the piano.''
Celebrating the gothic rock movement of the 80s and beyond.
On their self-titled debut album, it's really game time for jazz rappers Injury Reserve.
Celine Dion barely cracks a smile and yet she's the greatest guest yet.
Add this guy to your playlist ASAP.
Phildel has gone back a step, in terms of her musical compositions, and returned to a style more reminiscent of her debut album with her latest...
To promote the release of her latest album 'Designer', Aldous Harding has undertaken an extensive European tour. On Wednesday night Harding played to...
Injury Reserve have spent the last few years rising to the top of underground hip-hop and becoming one of the most exciting acts in the whole genre.
Country music has long been associated as a storytelling journey, but the evolution of the...
After having a music career that spanned five decades and saw the release of over...