Former Disney Princess Demi Lovato stops Taylor Swift's reign on MYX International Top 20 and MYX Hit Chart with her new single "Heart Attack."

MYX INTERNATIONAL TOP 20
(April 27 to May 3, 2013)

1. Demi Lovato – Heart Attack [+5]
2. Justin Bieber feat Ludacris – All Around The World [+6]
3. Taylor Swift – 22 [-2]
4. One Direction – One Way Or Another (Teenage Kicks) [-2]
5. The Jonas Brothers – Pom Poms [-1]
6. Paramore – Still Into You [-1]
7. Lawson – Learn To Love Again [-4]
8. Jessica Sanchez feat Ne-Yo – Tonight [-1]
9. Pink feat Nate Ruess – Just Give Me A Reason [=]
10. Ariana Grande feat Mac Miller – The Way [+1]
11. Nicki Minaj feat Lil’ Wayne – High School [-1]
12. Psy – Gentleman [NEW]
13. CNBlue – I’m Sorry [=]
14. Before You Exit – A Little More You [+1]
15. Little Mix feat Missy Elliott – How Ya Doin’ [+1]
16. SHINee – Dream Girl [-2]
17. Justin Timberlake – Mirrors [+1]
18. Anna Kendrick – Cups (When I’m Gone) [NEW]
19. Fall Out Boy – The Phoenix [NEW]
20. Will.I.Am. feat Justin Bieber – #ThatPower [NEW]

MYX HIT CHART
(April 28 to May 4, 2013)

1. Demi Lovato – Heart Attack [+7]
2. Justin Bieber feat Ludacris – All Around The World [+8]
3. Taylor Swift – 22 [-2]
4. One Direction – One Way Or Another (Teenage Kicks) [-2]
5. The Jonas Brothers – Pom Poms [-1]
6. Paramore – Still Into You [-1]
7. Lawson – Learn To Love Again [-4]
8. Callalily – HKM (Hindi Kita Malilimutan) [-1]
9. Sarah Geronimo – It Takes A Man And A Woman [-3]
10. Jessica Sanchez feat Ne-Yo – Tonight [-1]
11. Luigi D’ Avola – Take A Chance [+1]
12. Pink feat Nate Ruess – Just Give Me A Reason [-1]
13. Ariana Grande feat Mac Miller – The Way [+3]
14. Nicki Minaj feat Lil’ Wayne – High School [+1]
15. Sponge Cola – Pick Your Poison [NEW]
16. Franco – Better Days [+3]
17. Psy – Gentleman [NEW]
18. Sandwich – Back For More [NEW]
19. Rocksteddy – Sama-Sama [NEW]
20. Barbie Forteza – Meron Ba [NEW]