United Kingdom, March 3 -- Justin Bieber's wife Hailey has shut down rumours about their marriage.

The model, 27, confirmed she was happier than ever with singer Justin - who turned 30 on 1 March - by sharing a birthday tribute to him online.

She captioned a series of images - and a video of her kissing Justin - on her Instagram, alongside the caption: "30!!!!!!!????!!????!!!! (wide-eyed and crying face emojis) that was fast.

"Words could never truly describe the beauty of who you are. Happy Birthday to you. love of my life, for life. (Grey heart emoji.)"

Hailey's post comes after she and Justin were last week spotted attending a late-night church service hours after the model's dad Stephen Baldwin appealed for prayers for the couple....