Justin Timberlake; Britney Spears.Photo:Axelle/Bauer-Griffin/FilmMagic, Dimitrios Kambouris/WireImage

Axelle/Bauer-Griffin/FilmMagic, Dimitrios Kambouris/WireImage
Britney Spears' praise forJustin Timberlake’s new music was sincere.
After the pop superstar complimented Timberlake’s latest single"Selfish"in anInstagram postshared Monday, sources tell PEOPLE she’s truly a fan of her ex-boyfriend’s current musical output.
“Honestly she just wanted to wish him well. She really does like the song,” an insider tells PEOPLE. “She’s a kind person.”
Another source adds, “She genuinely just loves good music. She was curious about [Timberlake’s] new tracks, and she really likes his new music.”
“Britney has a good heart and is full of compliments when she likes something,” continues the second insider. “She always speaks her mind. That’s what’s so special about her.”
On Instagram, Spears, 42, celebrated Timberlake’s lead single and his second new track “Sanctified,” which hedebuted onSaturday Night Liveover the weekend.
Britney Spears; Justin Timberlake.J. Merritt/Getty Images; Matt Winkelmeyer/Getty Images

J. Merritt/Getty Images; Matt Winkelmeyer/Getty Images
The “Toxic” singer, who split from the *NSYNC member in 2002, also said she’s sorry to anyone she “offended” with her memoir,The Woman in Me, in the post.
“I wanna apologize for some of the things I wrote about in my book. If I offended any of the people I genuinely care about I am deeply sorry…” she wrote alongside a clip of Timberlake, 42, performing a medley of his hits with The Roots on Thursday’s episode ofThe Tonight Show Starring Jimmy Fallon.
Spears continued, “I also wanted to say I am in love with Justin Timberlake’s new song ‘Selfish’ 🌹 It is soo good and how come every time I see Justin and Jimmy together I laugh so hard ??? Ps ‘Sanctified’ is wow 🤩 too.”
Justin Timberlake and Britney Spears in January 2003.Denise Trusc / Getty

“If it had been left up to me alone, I never would have done it. And yet Justin was so sure that he didn’t want to be a father,” she added.
She also wrote of her experience undergoing the abortion: “To this day, it’s one of the most agonizing things I have ever experienced in my life.”
Britney Spears performs in Las Vegas in June 2016.Marco Piraccini\Archivio Marco Piraccini\Mondadori via Getty

Marco Piraccini\Archivio Marco Piraccini\Mondadori via Getty
Spears' Instagram post comes after her2011 track “Selfish” overtook Timberlake’s songof the same name on iTunes following a push from her fans to support the 13-year-old track.
Timberlake’s “Selfish” and “Sanctified” feature on the father of two’s upcoming album,Everything I Thought It Was, which he will release on March 15.
source: people.com