Vanessa Hudgens and Gerard Butler party together on boat in Malibu during surprise birthday for pal

Vanessa Hudgens and Gerard Butler party together on a boat in Malibu… as part of surprise 40th birthday for friend Oliver Trevena

Vanessa Hudgens and Gerard Butler spent a day on a boat together this past weekend.

And it turns out they were among a small group of people who surprised their friend, Oliver Trevena, on his 40th birthday with an afternoon of partying on the Pacific Ocean near Malibu, California on Sunday.   

Butler and another mate helped lead Trevena, who was blindfolded, along a dock until they reached the small boat, where Hudgens and a handful of other friends were waiting. 

Surprise! Gerard Butler and Vanessa Hudgens took part in a surprise 40th birthday party on a boat in Malibu, California for mutual friend Oliver Trevena on Sunday, May 9

Bash: Trevena and Hudgens posted videos on Instagram taken during the party on the Pacific Ocean, which included one where the High School Musical alum danced with BFF GG Magree

Bash: Trevena and Hudgens posted videos on Instagram taken during the party on the Pacific Ocean, which included one where the High School Musical alum danced with BFF GG Magree

Trevena posted some videos on Instagram showing him being led to the boat as the pair held his hands, all while trying to keep the surprise under wraps.

When they finally did make it to the entrance of the boat, everyone yelled out: ‘Surprise and happy birthday.’

‘When your friends kidnap you at lunch!!!!! A Birthday I will NEVER forget!!’ Trevena wrote in the caption of his Instagram post. 

In the dark: Butler and another mate helped lead Trevena, who was blindfolded, to a dock

In the dark: Butler and another mate helped lead Trevena, who was blindfolded, to a dock

Easy does it: The pair made sure to hold his hands so that he didn't take a fall

Easy does it: The pair made sure to hold his hands so that he didn’t take a fall

Keeping cool: The British actor and television personality appeared to be completely in the dark about what his friends had in store for him on his 40th

Keeping cool: The British actor and television personality appeared to be completely in the dark about what his friends had in store for him on his 40th

‘I literally had NO idea & was extremely scared thanks to @gerardbutler sound effects he was playing in my ear!! I’ve truly never been so surprised.’

He added, ‘THANK YOU @morgannyc @vanessahudgens @ggmagree @gerardbutler @official_lenaroklin @peter_landesman @throughkevinseye @xo_vanessak & @scottlastaiti for the most magical day & also Thank you to all the DOLPHINS that literally kept us company the entire trip!!! Wow. Wow. Wow.’  

Dressed in baby blue sweatpants and a cropped tank top, Hudgens was able to watch in amazement as several dolphins swam along with their speeding boat.

In a separate video, Hudgens and her BFF GG Magree can be seen dancing in the bow of the boat with a cute golden dog that was brought along for the party.

Keeping him steady: : The man of the hour needed help when he got to the boat

Keeping him steady: : The man of the hour needed help when he got to the boat

Revelers: Hudgens and Magree were among the partygoers to be waiting on the boat

The reveal: The birthday boy was stunned when they took off his blindfold to see all his friends on the boat

The payoff: When Trevena finally did make it to the entrance of the boat, everyone yelled out: ‘Surprise and happy birthday’

Emotional: Trevena got a big kiss from Butler hen he finally got to take off the blindfold

Emotional: Trevena got a big kiss from Butler hen he finally got to take off the blindfold

Movin' to the groovin': Later in the afternoon, Hudgens and Magree broke out into a dance on the bow of the boat

Movin’ to the groovin’: Later in the afternoon, Hudgens and Magree broke out into a dance on the bow of the boat

Snap shot: The old friends caught the moment on camera and posted it on Instagram

Snap shot: The old friends caught the moment on camera and posted it on Instagram

Revealing: The BFF's flaunted their midriffs in cropped tank tops

Revealing: The BFF’s flaunted their midriffs in cropped tank tops

Butler, who dressed casually in brown cargo pants and a white and red shirt, could also be heard in the background enjoying the impromptu show by the gorgeous mammals.   

The party also included Butler’s girlfriend Morgan Brown, filmmaker Peter Landesman, talent manager Lena Roklin, Next Health co-founder Kevin Peake, among a few others.

While Butler has been mates with Trevena, Hudgens is connected to the British actor and television personality as business partners in the newly launched beverage company called Caliwater.

Trevena is best-known for his acting and for hosting the hugely popular celebrity chat show, Young Hollywood (2007).              

Assessing the situation: The two ladies donned captain's caps for a photo with the pet pooch

Assessing the situation: The two ladies donned captain’s caps for a photo with the pet pooch

Impromptu show: The partygoers got to sit back and watch the show a few dolphins put on when the boat was cruising along at a decent speed

Impromptu show: The partygoers got to sit back and watch the show a few dolphins put on when the boat was cruising along at a decent speed

'Wow': Hudgens and Butler could be heard relishing in the dolphins escapades

‘Wow’: Hudgens and Butler could be heard relishing in the dolphins escapades

The big 4-0: The Birthday boys was decked out in some tradition party favors

The big 4-0: The Birthday boys was decked out in some tradition party favors

Glowing: The actress and the singer struck a pose for a photo on the bow of the boat

Glowing: The actress and the singer struck a pose for a photo on the bow of the boat