The 47-year-old Australian singer and 28-year-old British actor attended the annual awards ceremony at the O2 arena in London just days after announcing their engagement.
Minogue was all smiles in a lace Dolce & Gabbana dress as she flashed her diamond sparkler. She and Sasse were casually affectionate as they posed for photos on the red carpet.
The "Can't Get You Out of My Head" singer and Sasse met on the set of ABC series Galavant and have been linked since September. The pair reportedly got engaged on a ski vacation and announced the news in The Daily Telegraph.
Minogue is a three-time BRIT Award winner but was not nominated at this year's ceremony. The singer had plenty else to celebrate, however, as the event fell on the 10-year anniversary of her "all clear" from breast cancer.
"Today marks my official 10 year 'all clear' from breast cancer," she wrote on Instagram. "Naturally, my nearest and dearest were at the forefront of my mind. Behind the tears were relief and thanks and thoughts. Thoughts of those who are making their way toward this landmark, those who are past the landmark and of those who we sadly miss."
"Thank you just doesn't say enough," she added. "@londonmarathon is coming up and @joshuasasse will be running it to raise funds for Breast Cancer Care @breast_cancer_care (He has never run a marathon before!) #Lovers, please support him so we can raise as much as possible! You can sponsor him at virginmoneygiving.com/RunSasseRun. I love you all."
Minogue last released the holiday album Kylie Christmas in November and guest starred on Galavant in January. Sasse plays the title character on the musical comedy, which completed a second season last month.
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