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Kate Cassidy is sharing a glimpse into her love story with Liam Payne ... uploading a sweet tribute on what would've been the singer's 32nd birthday.

The TikTok star shared a video montage Friday on Instagram of candid moments of herself and Liam enjoying everything from adventures abroad, to meals together, to other intimate moments.

KC said the tribute was meant to commemorate "a special day for a special soul," noting just how much she missed her former flame.

She added ... "Happy Birthday Liam. I wish we could celebrate together. In the next life I guess❤️"

This isn't the first time Kate has opened up about her heartbreak in the aftermath of Liam's death. Remember, Kate had been with Liam in Argentina in the days leading up to his death in October ... she

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