'Skyscraper' singer Demi looked in high spirits as she arrived at the Good Morning America studios in Manhattan on Thursday morning (24 October).
Demi – who is promoting her book Staying Strong - was perhaps in a good mood after hearing about close friend Kim's engagement to rapper Kanye.
Kanye proposed to Kim on her 33rd birthday this week, renting an entire baseball stadium so he could project the words 'please marry me' onto a giant screen as he got down on one knee.
Naturally, Demi was thrilled for her pal – though she joked to E! News she would be keeping a close eye on Kanye!
Demi, who says Kim's been a "great friend" to her over the years, said: "I've told Kanye before that if he doesn't treat her well, I'm going to come after him!"
Yikes! With that bright blue hair though, he might see her coming…
Demi has been rocking her eye-catching hue since the start of October, when she debuted it during an appearance on The Tonight Show With Jay Leno.
A few weeks on and she's still loving it as she posted a fun picture to Twitter yesterday with the caption: "Blue hurr, don't curr."
Demi's been busy lately with her judging role on US X Factor alongside Simon Cowell and promoting her book Staying Strong: 365 Days A Year, which is a collection of Demi's "most honest, brave and hopeful insights" alongside quotes that inspire her, personal reflections and her goals.
Watch Demi's music video for 'Made In The USA' below: