Jordin Sparks mourns deaths of loved ones, including step-sister

Pop star Jordin Sparks mourned the deaths of four loved ones who each died in the past week.

The singer shared her heartbreak in an Instagram tribute after losing her teenage step-sister Bryanna Jackson-Frias, her cousin "Q" and her friends Rasual Butler and Leah LaBelle.

"My heart is just so heavy & broken. I'm in shock, numb and feel everything all at the same time," Sparks wrote in the post. "Leah & Rasual (one of my closest friends and her amazing other half who also was a great friend), Bryanna (my step sister) and Q (my little cousin), you were such bright lights in this crazy world."

She continued: "You made everyone better just by knowing them. And your smiles made anyone's day better. The world is less sparkly without you in it. Rest In Peace and Power. I love you forever."

See photos of Leah LaBelle:

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Leah LaBelle throughout her life
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Leah LaBelle throughout her life
Leah Labelle during 'American Idol' Season 3 - Top 12 Finalists Party - Arrivals at Pearl in Los Angeles, California, United States. (Photo by SGranitz/WireImage)
Leah Labelle at the Kodak Theatre in Hollywood, California (Photo by Jean-Paul Aussenard/WireImage)
LOS ANGELES, CA - FEBRUARY 14: Leah LaBelle attends the American Idol Season 7's Top 24 Party at The Day After Club on February 14, 2008 in Los Angeles, California. (Photo by Jean Baptiste Lacroix/WireImage)
LOS ANGELES, CA - SEPTEMBER 10: TV personality Leah LaBelle attends the 10th Annual BMI Urban Awards at the Pantages Theatre on September 10, 2010 in Los Angeles, California. (Photo by David Livingston/Getty Images)
HOLLYWOOD, CA - APRIL 11: Singer Leah LaBelle arrives at ELLE in Women Music 2012 at Avalon on April 11, 2012 in Hollywood, California. (Photo by John Shearer/WireImage)
NEW YORK, NY - APRIL 18: (L-R) Pharrell Williams and Leah Labelle attend W.i.P on April 18, 2012 in New York City. (Photo by Johnny Nunez/WireImage)
NEW YORK, NY - APRIL 18: (L-R) Pharrell Williams, Leah Labelle, and Cedric The Entertainer attend W.i.P on April 18, 2012 in New York City. (Photo by Johnny Nunez/WireImage)
NEW YORK, NY - MAY 15: Singer Leah Labelle visits the Boy Meets Girl Lounge on May 15, 2012 in New York City. (Photo by Taylor Hill/Getty Images)
NEW YORK, NY - MAY 15: Leah Labelle is seen at Greenhouse on May 15, 2012 in New York City. (Photo by Johnny Nunez/WireImage)
WEST HOLLYWOOD, CA - MAY 30: Singer Leah LaBelle arrives at the NYLON Magazine June/July Music Issue Launch Party With Shirley Manson at The Roxy Theatre on May 30, 2012 in West Hollywood, California. (Photo by Amanda Edwards/WireImage)
NEW YORK, NY - JUNE 19: Leah LaBelle attends the Summer Party on the HIGH LINE, Presented by COACH at The Highline on June 19, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Coach)
NEW YORK, NY - JUNE 20: (L-R) Jermaine Dupri, Leah LaBelle, and Pharrell visit BET's '106 & Park' at BET Studios on June 20, 2012 in New York City. (Photo by D Dipasupil/Getty Images)
NEW YORK, NY - JUNE 21: Singer Leah Labelle performs at Tribeca Grand Hotel on June 21, 2012 in New York City. (Photo by Johnny Nunez/WireImage)
LOS ANGELES, CA - JULY 01: Recording artist Leah LaBelle arrives at the 2012 BET Awards at The Shrine Auditorium on July 1, 2012 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)
NEW ORLEANS, LA - JULY 07: Leah LaBelle performs during the 2012 Essence Music Festival at Louisiana Superdome on July 7, 2012 in New Orleans, Louisiana. (Photo by Erika Goldring/Getty Images)
EAST HAMPTON, NY - AUGUST 11: Paul McCartney and Leah Labelle performed at Apollo In The Hamptons: A Night Of Legends at The Creeks on August 11, 2012 in East Hampton, New York. (Photo by Shahar Azran/WireImage)
EAST HAMPTON, NY - AUGUST 11: Leah Labelle attend Apollo In The Hamptons: A Night Of Legends at The Creeks on August 11, 2012 in East Hampton, New York. (Photo by Shahar Azran/WireImage)
LAS VEGAS, NV - NOVEMBER 08: Singer Leah LaBelle arrives at the Soul Train Awards 2012 at PH Live at Planet Hollywood Resort & Casino on November 8, 2012 in Las Vegas, Nevada. (Photo by Earl Gibson III/Getty Images for Centric)
WEST HOLLYWOOD, CA - FEBRUARY 06: Singer Leah LaBelle attends the 4th Annual ESSENCE Black Women In Music honoring Lianne La Havas and Solange Knowles at Greystone Manor Supperclub on February 6, 2013 in West Hollywood, California. (Photo by David Livingston/Getty Images)
HOLLYWOOD, CA - FEBRUARY 07: (L-R) Recording artists Leah LaBelle, Ciara and Ginny Blackmore attend the Pre-Grammy Showcase For Epic Records Recording Artist Ginny Blackmore at Beachers Madhouse at Roosevelt Hotel on February 7, 2013 in Hollywood, California. (Photo by Larry Busacca/Getty Images for Epic Records)
LOS ANGELES, CA - FEBRUARY 08: Recording artist Leah Labelle arrives at BET Network's Music Matters Showcase 'Lipstick On The Mic' at Belasco Theatre on February 8, 2013 in Los Angeles, California. (Photo by Angela Weiss/Getty Images)
LOS ANGELES, CA - FEBRUARY 08: Singer Leah Labelle performs at the BET Music Matters Grammy Showcase on February 8, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images for BET)
LAS VEGAS, NV - MARCH 24: R&B singer Leah LaBelle arrives at the Lavo Restaurant & Nightclub at The Palazzo Las Vegas on March 24, 2013 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
LAS VEGAS, NV - JULY 19: NBA player Rasual Butler (L) and singer Leah LaBelle attend The Players' Awards presented by BET at the Rio Hotel & Casino on July 19, 2015 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images for BET)
HOLLYWOOD, CA - OCTOBER 03: Leah LaBelle performs at Tru Hollywood on October 3, 2013 in Hollywood, California. (Photo by Jeff Golden/Getty Images)
HOLLYWOOD, CA - SEPTEMBER 21: Leah Labelle at Le Jardin on September 21, 2017 in Hollywood, California. (Photo by Thaddaeus McAdams/FilmMagic)
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Jackson-Frias, 16, died Tuesday after a lengthy battle with sickle cell anemia, People magazine reported. Sparks had asked her fans earlier that day to pray for Jackson-Frias, noting in a post to her Instagram story that her step-sister was in the intensive care unit "suffering from complications" stemming from the disease.

The teenage girl's mother, Jodi Jackson, shared the tragic news that her daughter had died in a Facebook post on Wednesday.

"Bry went peacefully to Heaven," she captioned a photo of Jackson-Frias. "I can't help to think that she's smiling just like this. Thank you all for your prayers."

Butler, a former NBA player, and his wife LaBelle, a singer, were killed in a single-car accident early Wednesday morning. Butler was driving at a high speed when his vehicle collided with the curb before hitting three parking meters and a concrete wall and flipping over twice, police said.

Butler was 38, and LaBelle was 31.

Sparks did not provide the identity of her cousin Q, nor did she reveal a cause of death. A rep for the singer did not immediately respond a request for comment.

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