Katy Perry slammed the paparazzi for taking photos of her using a long lense in her home, explaining they are "illegal", taken against her will and endangering her privacy.
The Teenage Dream singer and Super Bowl halftime show headliner issued the stern warning to her massive 69.4 million Twitter followers at the weekend.
Normally stars issue these sort of legal warnings via email to publications, but as she's the most followed person on Twitter, Katy probably saved a lot of time by just posting on there.
In fact, she has SO many followers, maybe she should start issuing public service information about the weather, bad traffic and what time Better Call Saul will be on Netflix.
Katy Perry was snapped enjoying some much needed downtime with pal Rihanna at the Grammys. The pair, who have been friends for years, looked like they were having a blast. At one point Katy stroked RiRi’s major pink dress and then spent some time cooing over her finger jewels.
Grammys 2015: Best dressed
grammy awards 2015 style
1 of 19Kelly Osbourne
We are SO into Kelly O's uber-covered up monochrome dress. Edgy, cool and way flattering, we also love the way it sets off her lilac locks. Go, Kel!
2 of 19Guiliana Rancic
Kelly's red carpet presenter buddy Guiliana rocked a sheer panelled LBS with scarlet lips for the event. Her sharp blunt bob co-ords beautifully with her pointed panels.
3 of 19Charli XCX
We LOVE Charli's fun take on red carpet styling! What a babe.
4 of 19Haim
US rock-pop sisters Haim brought their individual style to the Grammys. We can't pick a fave, can you?
5 of 19Kat Graham
Kat's sheer frock was almost toooooo sheer. Luckily the flawless beauty and glossy top knot made it look cool rather that trashy.
6 of 19Ariana Grande
Petite pop star Ariana gave great style in her white hot Versace frock with silver detailing. Still owner of the best high pony in recent years.
7 of 19Chrissy Teigen
Another ice-white Grammys babe! Chrissy see-through caged detail stayed on the right side of flashy.
8 of 19Gwen Stefani
How teeny tiny is Gwen?! We loved the star's Atelier Versace jumpsuit but miss her bright red pout.
9 of 19Jessie J
J-J-Jessie J! Rocking Goth glam in noir embellishment.
10 of 19Lady Gaga
She's not wearing meat! That's a celebration in itself. Even though Lady G's frock plunged deep and flashed thigh, we like the silvery embellishment so much we don't care. Plus, like we said, it's not salami.
11 of 19Katy Perry
We'll forgive those bridesmaid-esque heels because the dress is sparkly and divine.
12 of 19Meghan Trainor
The blogger who has taken over the music world looked fab in her sheer floor length party frock.
13 of 19Anna Kendrick
Anna looked like she meant proper business in her sharp noir suit!
14 of 19Iggy Azalea
Look. At. Iggy's. BOD. The rapper showed off her incred figure and wore the best plaited crown to the Grammys.
15 of 19Jennifer Hudson
Proof that simple is sometimes best! We love that pop of juicy purple lippy, too.
16 of 19Miley Cyrus
Miley shocked us by not being very shocking at all! She looked fresh-faced and stylish.
17 of 19Taylor Swift
Tay-Swizzle does it again! This time in an ombre sea-green high-low dress with clashing pink heels. Nice work, bae.
18 of 19Beyonce
Bey werking it like the Queen that she is in sassy black lace with a plunging neckline.
19 of 19Rihanna
This dress is as nutty as it is pink. We can see it's mad but there's still something quite pretty about seeing BadGalRiRi in all of that pink froth. Plus, her make up is giving us EVERYTHING.