The supportive boyfriend has already attended the first three of his partner's 'Just A Girl' Las Vegas residency shows at the Zappos Theater at Planet Hollywood, and he's been on hand to soak up the atmosphere early on.
He posted on Twitter: ''So far @gwenstefani has performed 3 shows in Las Vegas. I have been to 3... #stalker [sic]''
His joking social media post comes after Gwen, 48, revealed the 42-year-old singer has even been watching the 'Hollaback Girl' hitmaker during rehearsals, and giving his thoughts on the Sin City concerts.
She told 'Entertainment Tonight': ''He's, like, my bestie. So, of course he's seen everything as its been going and just bouncing off of him and stuff like that.''
Meanwhile, Gwen recently said feels like her beau has ''changed'' her life and praised him for being an ''amazing all-round human''.
She said: ''He's my homeboy. He's my homey. He's just really an amazing all-around human so I feel so grateful for that. I celebrate him in the show! He's inspired me so much. He's changed my life.''
And the No Doubt singer - who has sons Kingston, 12, Zuma, nine, and Apollo, four, with her ex-husband Gavin Rossdale - loves her family life but enjoys getting out on stage too.
She said: ''I'm so good to do my kids and do mom and hang out with my cute Blakey and all that but then when I get up there I realise it's in there still and I'm like, 'OK, I need this attention still. I like it.'
''So, it's always been there. It's whatever the gift that God gave me and I feel so grateful and I feel so humbled and honored to be in Vegas. To do a show like this, it's just another level and it's challenging in another way.''
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