Jamie Lynn Spears' Mom Cheers Her On for 'Dancing With The Stars' Debut Jamie Lynn Spears Mommy Lynne Cheers Her On ... During 'DWTS' Debut 487 9/27/2023 6:55 AM PT

Jamie Lynn Spears had her mom, Lynne, front and center for her debut on "Dancing With the Stars" -- but one person went unaddressed during her time on screen ... Britney.

The former Nickelodeon child star -- and BS's famous little sister -- did her one, two-step Tuesday for Season 32's premiere of 'DWTS' ... performing a tango with her dance partner Alan Bersten, which ended up receiving a somewhat average score of just 15/30.

Of course, the real focus seemed to be what was happening offstage -- namely, with who showed up in person to support JLS ... including her mama and other family members.

Lynne was out there cheering her head off for her daughter -- which is awesome ... but the sweet moment was unfortunately somewhat overshadowed by looming concern for Britney, who's been posting disturbing videos over the past 48 hours.

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Of course, we're referring to Britney's knife dance clips that have gone up on her social media ... including one just yesterday that appeared to show her injured, with a bandaged arm, a nicked though, and some sort of red mark on her hip.

Some have speculated they could be from the knives she's been wielding during these at-home dance routines ... and it's spurred a lot of commentary about her well-being.

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Like we said ... Jamie Lynn didn't talk Britney at all during Episode 1, nor did she even allude to her. We know JLS and Britney have had a rocky relationship over the past year and change, but despite this ... our sources say BS knew her sis would be on TV here.