Katy Perry has offered to write Hillary Clinton's presidential campaign song.

The 'Part Of Me' singer took to Twitter to extend the offer to the US Secretary of State and potential presidential candidate for the 2016 US elections after meeting her at a reception in Los Angeles on Thursday (19.06.14).

Katy shared a picture of the pair and wrote on the social networking site on Friday (20.06.14): ''I told hillaryclinton that I would write her a ''theme'' song if she needs it...''

Hillary, 66 - who is yet to announce whether she will run for president - replied to the singer on Saturday (21.06.14) and hinted the Katy's hit single 'Roar' would be the perfect theme tune.

She wrote on Twitter: ''@katyperry Well that's not a Hard Choice. You already did! Keep letting us hear you Roar.''

Meanwhile, Katy recently teamed up with her record company Capitol to launch her own record label Metamorphosis Music.

The 28-year-old - who has already signed her first singer/songwriter Ferras Alqaisi to the imprint - broke the news on Twitter last week.

She wrote: ''I am so ECSTATIC to finally announce my NEW label Metamorphosis Music & my first signing, the incredibly talented & soulful FERRAS! (sic)''

Katy went on to praise her new signing and promoted his new self-titled EP, which includes a duet with her entitled 'Legends Never Die'.

She added: ''USA/CANADA: check out his INCREDIBLE ep here (& our duet!) and come see him play on #ThePrismaticWorldTour (sic).''