Bobbi Althoff appeared deep in conversation while walking around L.A. ... engrossed in a phone call less than a day after news of her split from her husband Cory broke.

The famed TikToker looked casual in a pink sweater and black Nike sweats while enjoying a beautiful Los Angeles morning ... and even cracking a small smile while chatting up someone on the phone.

It hasn't been the easiest week for Bobbi -- with news of her divorce breaking yesterday -- but it seems she's putting her bravest face on for the rest of the world.

As we previously reported ... Bobbi's about to become a single woman after her husband of four years Cory filed for divorce citing "irreconcilable differences."

Their marriage ending doesn't exactly seem like a shock to BA ... since Cory listed the date of separation as July 4, 2023 -- and she wrote about her marriage's end in an eloquent caption she posted to IG yesterday.

She noted she's going through quite a difficult time in the post ... so it's nice to see Bobbi with a smile on her face, even if it's only in the moment here.

BTW ... Cory's asking for joint physical and legal custody of their two daughters, 1-year-old Isla and 3-year-old Luca while also checking the box to block the court's ability to award spousal support to either party.

Of course, Bobbi's dominated TikTok over the past year with her deadpan-style humor and interviews with major celebs ... and Cory's no slouch professionally as well with an executive position for a major tech company.