Reports have claimed the 48-year-old supermodel is dating the One Direction star, 25, and both attended the WE Day charity youth event at London's SSE Arena, Wembley, on Wednesday, March 06.
However, both arrived on the red carpet separately, albeit only 10 minutes apart, and Naomi gave short shrift to reporters who asked her about Liam.
"Thank you so much", she said after a question about her purported beau, before swiftly walking away.
According to British newspaper The Sun, the pair have been enjoying a fling since December (2018) and he was spotted leaving her apartment following the BAFTA film awards last month. They have also reportedly visited Ghana together.
"Naomi has told Liam she is enjoying having fun but that is all she is ready for at the moment," a source told the publication. "She has said she's found him a bit too clingy and full-on and does not want a committed relationship at this stage. He accepted it but was a bit crushed."
"He is in awe of her and is finding it tough that she is so strong-willed and the one in control. Liam seems to be a bit of a puppy dog around her and friends have warned him the situation is a car crash waiting to happen."
The "Strip That Down" hitmaker, who split from fellow British popstar Cheryl Cole last year (2018), is currently spearheading a campaign against Britain's knife-crime problems, telling his Twitter followers how he was once robbed at knife-point. However, Naomi declined to talk about the issue.
"I don't know much about the knife epidemic in London at the moment, I don't live here," she said, denying she knew anything about any anti-knife campaigns.
Naomi gave a speech to the WE Day crowd, sending a message of female empowerment and telling youngsters to pursue their "passion", while Liam performed his collaboration with DJ Zedd, "Get Low".