Hollywood stars and producers have taken to Twitter.com in an outpouring of grief following the death of actor Paul Walker, who was killed in a horrific car crash in California on Saturday (30Nov13). The Fast & Furious star died when the Porsche he was a passenger in smashed into a tree and exploded. The 40 year old and the car's driver both perished. In the subsequent hours after news broke of his death, dozens of Walker's celebrity pals and ex co-stars reached out to his family to offer their condolences and memories of the likeable actor. Vin Diesel, who worked with Walker on five Fast & Furious films, writes, "Brother, I will miss you very much. Heaven has gained a new angel. Rest in peace. My brother and I.....we aimed for the stars together....and achieved more than we ever hoped we could with f&f (Fast & Furious)." Dwayne 'The Rock' Johnson, who starred alongside Walker in 2011's Fast Five, writes, "All my strength, love & faith to the Walker family during this heartbreaking time. We find our strength... in his light. Love you brother." Rapper Ludacris, who stars in the sixth and upcoming seventh installments of the hit franchise, adds, "Your humble spirit was felt from the start, wherever you blessed your presence you always left a mark, we were like brothers & our birthdays are only 1 day apart, now You will forever hold a place in all of our hearts paulwalker legacy will live on forever. R.I.P." Fast & Furious 7 director James Wan writes, "I am so beyond heartbroken right now. I can't process anything." Bosses at the franchise's studio, Universal, add, "All of us at Universal are heartbroken. Paul was truly one of the most beloved and respected members of our studio family for 14 years, and this loss is devastating to us, to everyone involved with the Fast and Furious films." Jessica Alba, who starred opposite Walker in 2005's Into the Blue, writes, "RIPPaulWalker - he was a lovely person - so sweet and grounded. My heart goes out to his family", while his The Skulls co-star Joshua Jackson adds, "Damn. Hard to imagine someone so full of life taken so soon. My thoughts go out to your family. RIP Pauly Walker" The cast of 1999 teen hit She's All That also remembered the heartthrob fondly. The movie's star Rachael Leigh Cook says, "Paul was a truly good person in a town of questionable characters... A real life tragedy if there ever was one.", and Gabrielle Union writes, "This is awful. Awful. RIPPaulWalker pls (please) pray for his family, friends & fans. We've lost a great, laid back, sweet, cool man & father." His death comes just days after Walker gave a moving interview with WENN, in which he spoke about how he was enjoying life as a dad to his teenage daughter Meadow since she had moved in with him last year (12). He said, "She started living with me last year just when I was leaving to go to work on Fast (& Furious 6). It's really kind of tearing on me trying to maintain the balance. She just turned 15 and it's a critical time. I'm big with analogies so I look at it like this big rocket ship and she's on this launching pad. "I want to get the trajectory right. It's just me and my daughter and I'm gonna be her dad for the rest of our lives so I want it to be cool. I sure as hell don't want to be looking back and go, 'F**k, what if, and I should've been home more'. She's super supportive and is like, 'No, go; this is what you do'. I'm like, 'We've got three years and you're gonna be out of the house. How much longer before you show up with Johnny?' "We're really honest with each other which is cool. She tells me what her needs are and tries to be a little tougher than I want her to be sometimes. I want her to be more revealing like, 'You're not home enough...' I want her to say those things."