Katy Perry and Orlando Bloom Pack on PDA Again at Cancer Immunotherapy Launch

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and continue to show affection for one another. The “Part of Me” singer and the 39-year-old actor reportedly packed on the PDA while attending the Parker Institute for Cancer Immunotherapy Launch in Los Angeles on Wednesday, April 13.

Katy was seen wearing a floor-length black leather dress which she teamed with a silver belt. She looked beautiful sporting smokey eyes with her hair tied up in a bun. Meanwhile, Orlando opted for a dapper look rocking a black suit over a white shirt complete with a black bow tie.

Though the pair walked the red carpet separately, an eyewitness claimed that the two got affectionate while inside the venue. “They were sitting next to each other,” the eyewitness told PEOPLE. “Bloom had his arm sweetly draped around Perry’s chair as they chatted with . The pair seemed to be in a great mood.”

Neither Katy nor Orlando has confirmed their romantic relationship, but the fact that they have spent a lot of time together may convince people that they’re really dating.

The star-studded event, which was held at Sean Parker’s home, was also attended by , , , , , and .