The "Toxic" singer, who has been dating Asghari for two years, shares sons Sean Preston, 13, and Jayden James, 12, with ex-husband Kevin Federline. Britney and Asghari were first linked after they met on the set of her "Slumber Party" music video back in 2016.
Asghari's post came just two days after Britney and her estranged mother Lynne Spears appeared in court on Friday as Lynne is fighting to gain access to the singer's medical records following Britney's 30-day stay in a mental health facility, according to TMZ.
TMZ reports Britney still isn't doing well after her 30-day stay.
The judge ruled in Friday's conservatorship hearing that Britney receive an expert evaluation. Sources also told TMZ, Britney asked the judge to allow her certain freedoms she doesn't have under the conservatorship, however, the judge did not grant any of her requests.
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Asghari's Mother's Day tribute to Britney isn't the first time he's showed support for his girlfriend on social media. After the "Piece of Me" singer checked into the mental health facility, Asghari reshared one of Britney's posts with a new caption championing her "absolute strength" and saying how much she is inspiring him by putting her mental health needs first.
The reshared post read: "Fall in love with taking care of yourself. Mind. Body. Spirit." In the caption, Asghari wrote the same words he shared in the second photo. "It isn't weakness, It's a sign of absolute strength, people should only be inspired by this, at least I am."
The personal trainer also added a heart and "stronger," no doubt a reference to Britney's 2000 hit of the same name.