Having shed her long dark looks for a blonde pixie crop and graduated from catchy pop to a more experimental sound, Katy Perry has asked the world to “WITNESS” the next chapter of her career with her fifth studio LP which dropped on Friday.

Gutter HQ takes a look back at the 8 musical moments that encapsulate KP’s career best, so far . . .

8. Chained To The Rhythm (Feat. Skip Marley)

The lead single from Perry’s latest LP, “Witness” saw her recruit a little help from Bob Marley’s grandson, Skip Marley; “Chained To The Rhythm” had KP shed her bubblegum pop signature sound in exchange for a more reggae vibe. It went to #5 in The UK Singles Chart following its release in February of this year.

7. Starstrukk (With 3OH!3)

Electronic duo, 3OH!3 joined forces with Katy Perry in 2009 with this sizzling slice of infectious pop, the second single from their second studio effort, “Want”. The collaboration came in the wake of the pair supporting Perry on her “Hello Katy” Tour in 2008.

6. Dark Horse (Feat. Juicy J)

Following a string of successful collaborations with the likes of Timbaland, Kanye West and Snoop Dogg, Perry teamed up with Juicy J in 2013; “Dark Horse” was the third single taken from Perry’s fourth studio LP, “Prism”. The accompanying promo was one of KP’s most visually stunning yet with an Egyptian theme and Perry as a Cleopatra-style goddess.

5. Teenage Dream

The lead single from the album of the same name dropped in July 2010 and saw KP throwback to the euphoric feelings of being in teenage love; the Californian-born singer was in a romantically involved with comic Russell Brand who she went onto marry later that year, and the song was reportedly written about their relationship. The single reached #2 in The UK Singles Chart, but scored Perry a US #1.

4. Wide Awake

Perry was painting a slightly different picture in 2012 when pop power ballad, “Wide Awake” dropped, the second single to be taken from the deluxe version of “Teenage Dream : The Complete Confection” which was released in March 2012. The accompanying promo sees KP and a child version of herself battle through a twisted, and sometimes dark and disturbing fairy-tale world; the single is lyrically about breaking up and moving forward. “Wide Awake” scored Perry a Top 10 Hit Single in The UK.

3. Roar

KP brought the pop power in August 2013 with the lead single from her fourth studio effort, “Prism”. A video teasing “Prism” saw Perry burning her iconic blue wig from her “Teenage Dream” album and accompanying tour hinting that KP was ready to embark on a whole new chapter of her career; “Roar” centres around self-empowerment and saw critics compare its style to that of stadium style rock. The single scored Perry a UK #1 Single.

2. Firework

“Do you ever feel like a plastic bag?” may be one of the most nonsensical lyrics of our generation, but that didn’t stop “Firework” becoming an international hit single for KP in October 2010; it was the third single to be taken from “Teenage Dream”.

1. I Kissed A Girl

Perry exploded onto pop scene in 2008 with her risque debut single, “I Kissed A Girl” shedding her gospel singing days of being Katy Hudson for good. The equally audacious accompanying promo saw KP frolic in Moulin Rouge style basque with a group of girls including American actress, Shannon Woodward and then unknown pop singer, Kesha; the single sparked controversy due to its homosexual themes, but that didn’t stop it hitting #1 in over 20 countries worldwide.