Finally, confirmation from West Brom.
The 27-year-old left-back joins the Baggies on a four-year deal and has elected to wear the No. 3 shirt.
Gibbs joins the Baggies after spending more than a decade at Arsenal - where he made over 200 appearances for the Gunners - and with ten England caps to his name.
Gibbs, 27, thanked Arsene Wenger for giving him the opportunity to play for the club he supported as a boy while also stating how pleased he was to join the Baggies.
He wrote: "Firstly, I would like to say how delighted I am to sign for West Brom.
"It has been an amazing journey to play for my childhood club since I was 14. I would like to thank Arsene Wenger for giving me the chance to start my career and fulfil a dream!
"Thank you to all the fans, the Arsenal staff and especially my teammates who have been there during the special moments and have helped me through some tough times.
"Now it's time for the next chapter with West Bromwich Albion and I can't wait to get started with the boys!"
Albion's summer transfer window business has now seen Gibbs, Oliver Burke, Gareth Barry, Ahmed Hegazi and Jay Rodriguez join their squad for this season's Premier League challenge.
The Baggies have also signed China international striker Yuning Zhang who has started a two-year loan to Werder Bremen.
Kieran Gibbs has joined the Baggies from Arsenal on a permanent deal.
Delighted to have signed for @WBA ???????? ?? #WBA pic.twitter.com/LngeupoR5K — Kieran Gibbs (@KieranGibbs) August 30, 2017
It’s believed he has cost Albion a fee of £7million, and signed a four-year deal.
???? Here you go...
Welcome to the Baggies, @KieranGibbs!#WBA pic.twitter.com/NOSXkJHVfp — West Bromwich Albion (@WBA) August 30, 2017