In a statement released to Access Hollywood on Friday, Janet's manager said the songstress is "devastated" by the sudden death Michael, who died at the age of 50 on Thursday.
"Janet Jackson is grief-stricken and devastated at the sudden loss of her brother," her manager Kenneth Crear said in a statement to Access.
Many of Michael's family -- including sister LaToya and Brother Jermaine -- gathered at the UCLA Medical Center on Thursday afternoon after the King of Pop was transported via ambulance from his Holmby Hills home in Los Angeles.
Hours after the news of the singer's death was revealed, the family gathered at the home of Michael's parents – Joe and Katherine Jackson – in nearby Encino, Calif., as previously reported on Access Hollywood.com.
On Friday morning, Janet was photographed arriving at Van Nuys airport near Los Angeles, reportedly on her way to join her family.
"She [was] in pre-production on a film," Crear added.
Michael Jackson is survived by siblings Rebbie, Jackie, Tito, Jermaine, La Toya, Marlon, Randy and Janet – along with his parents Joseph Walter "Joe" and Katherine Esther.
He also has three children — Prince Michael Jackson, 12; Paris Michael Katherine Jackson, 11; and Prince Michael Jackson II, 7.
Related Content from AccessHollywood.com:
PLAY IT NOW: Michael Jackson's 911 Call (June 25, 2009)
PLAY IT NOW: Jermaine Jackson Press Conference On Michael Jackson's Death (June 25, 2009)