Heidi Montag and Spencer Pratt joined by celebrity pal at LA fire fundraiser… after losing their home

Heidi Montag and Spencer Pratt had a famous pop star help promote a fundraiser to support Los Angeles fire victims.

On Saturday, the reality TV couple stopped by a relief benefit at Lalaland Kind Cafe in Santa Monica that donated proceeds to the Altadena Girls Foundation, the LAFD and  Paws for Life K9 Rescue.

Lalaland Kind Cafe took to their Instagram Story to reveal that Canadian sensation Avril Lavigne, 40, had also arrived at the event.

The shop posted a video of the Girlfriend singer and Montag, 38, sipping on an iced coffee for the good cause.

Just prior, Spencer, 41, also took to his own page to share a video of himself and his wife making their way to the event while he teased that a 'major mega star' would be in attendance.

'We are 54 minutes out from Lalaland Cafe, I need every single person in LA to show up so the TV networks are like "Oh my gosh, they're so famous." Also, a major mega star is gonna stop by,' he said hinting at Avril. 

'Even more mega than Heidi,' he quipped. 

'@lalalandkindcafe Santa Monica 12:41 ish today! Please come help the Speidi Latte be the most famous drink ever !!! For a great cause 100 percent to LA fire relief,' he penned in the caption.

Later, Spencer was seen sipping on iced drinks with a pal in a later video posted to the cafe's Instagram Story.

Avril, Heidi and Spencer's special appearance in Santa Monica comes just over two weeks after the reality star couple tragically lost their $2M home in the Palisades Fire.

Since their abode had burnt to the ground, the pair have had an abundance of support from fans and other famous faces as well, streaming Heidi's music to earn her extra cash. In fact, they have earned new fans with their candid social media posts amid the chaos.

Now, the couple have now joined other homeowners in suing the city of Los Angeles over the damage to their properties. 

Their lawsuit, filed in California's Superior Court in Los Angeles County on Tuesday, accuses the Los Angeles Department of Water and Power of 'failing to maintain an adequate water supply system to fight the blazes.'

It further states that the blaze was 'an inescapable and unavoidable consequence' due to how the city and LADWP allegedly managed the area's water supply.

It points to 'delays in in repairing the Santa Ynez Reservoir, leaving the massive water storage complex in the heart of the Palisades empty for nearly a year.'

The lawsuit blames the LA Dept of Water and Power of emptying the reservoir before the fire, 'allegedly to seek contractor bids rather than use in-house personnel to repair it. This stated public purpose was far outweighed by the substantial risk posed to Pacific Palisades by wildfires.'

Earlier this month, Spencer revealed his plans to sue the State of California after his home was tragically burnt down.

'They never came. The gate was still locked,' he told blogger Perez Hilton. 'They never came. I watched from my security cameras until our house burned down. There were no fire trucks.'

As his home burned down, Pratt insisted that he called 911 and informed them that if they sent 'one fire truck' to his street that they 'could stop [the fire from] coming down the whole freaking area.'

In response to his suggestion to bring in a truck, he said he was told that the fire department didn't 'have the assets.'

The couple's home was flattened to the ground after the raging fire took over the LA landscape and wreaked fiery havoc, and photos obtained by DailyMail.com showed the severity of the devastation.