The Wanted star stepped out for his first red carpet event since moving Stateside on Tuesday evening, where he rubbed shoulders with the likes of Jennifer Garner.
Siva attended the annual Thirst Gala inside the Beverly Hilton hotel in California, which was this year hosted by leading lady Jennifer.
The Thirst Project, described as a "youth water activism organisation that builds freshwater wells in developing nations and impoverished communities", raised $250,000 during its fundraising event in 2013 – and Siva was clearly delighted to be supporting the worthy cause.
"Really excited to support @thirstproject" tonight at their annual #ThirstGala," he wrote on his Twitter, before sharing a photo of himself all dressed up and ready to go.
"#thirstgala #selfie Like my tux??" he captioned the snap.
Siva, 25, moved to LA with his fiancée, British shoe designer Nareesha McCaffery, and their pup Mylo, just last week.
"Hellooooooo sunny LA! Thank you so much for all your amazing send off messages, photos, and well wishes! Love ya all! xx," he tweeted upon his arrival in the US.
One of the first things the musician set about doing was buying a new set of wheels. "New city! New car @BMW," he posted a few days later alongside a photo of him posing beside his silver motor.
Siva has big plans during his time in the United States — not least his wedding to his long-term love Nareesha.
Speaking exclusively to HELLO! Online, Siva confirmed that the couple plan to tie the knot in the States next year, adding that with such a rich cultural heritage between them, there will be lots to decide upon.
The star will also be releasing his debut solo album — The Wanted announced they were taking break at the start of 2014 — which he says will be different to the band's sound.
The Wanted's Siva with fiancée Nareesha
"I want to go crazy," he told HELLO! Online, adding that his ideal collaboration would be with Pharrell Williams.
He is open to other career options too. "I'm a very creative person, I don't restrict myself," Siva said. "If someone offers me a show, I'm not going to turn it down."