Tony Hawk Skate Lesson W/ TikTok Star Addison Rae ... Here's How To Ollie!!!

What happens when the biggest skateboarding legend ever meets up with TikTok's most prominent star?!

OLLIE LESSONS, BABY!!!

Addison Rae -- one of the most-watched TikTokkers on the planet -- got a surprise meeting with Tony Hawk at The Berrics skatepark in L.A. this week ... and the two got to skating immediately!

20-year-old Rae explained to 52-year-old Hawk she's just getting into the sport ... and Tony LOVED it -- and offered her a million tips on how to ride like him.

No, there were no 900s ... but Tony helped her with some ramps -- and even gave her ollieing tips!!!

The clip is pretty cool, you can tell Addison is passionate about riding ... and Tony couldn't have been happier to see that.

"I think it's really cool that you're introducing skateboarding to a new generation of especially girls," Hawk said. "Because it is the great equalizer and it's all-inclusive and I feel like if kids can just see how fun it is and what it can do for them, they'll want to do it."

"And, I feel like you're really promoting that well. It's really cool."

FYI -- Addison truly is introducing the sport to A LOT of people ... she has over 68 MILLION followers on TikTok!!!

Lance Armstrong Shirtless on the Beach

With his 40th birthday less than two weeks away, Lance Armstrong showed off his smooth, ageless buff body on the beach in Maui on Tuesday.

The father of five is one hot daddy.

'Skating with the Stars' 911 -- He's 'Not Breathing Well'

TMZ has obtained the 911 call from when "Skating with the Stars" contestant Brandon Smith was rushed to the hospital ... in which the caller explains Brandon was "not breathing well."

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The caller also mentions that 20-year-old Brandon -- who stars on "Sonny with a Chance" with Demi Lovato -- "feels like vomiting."

As we first reported, a rep for the show claimed it was probably food poisoning -- but last week, Smith pulled out of "Skating" for the rest of the season because of the incident.

Brandon Smith Out of 'Skating' Due to Illness

Brandon Smith is pulling out of "Skating with the Stars" -- for the rest of the season -- because of the illness that forced him to miss the show last week ... TMZ has learned.

As TMZ first reported, Smith skipped last week's show after he started throwing up on set. A rep for the show told us at the time it was food poisoning.

We're told Smith has not been officially diagnosed and is still awaiting test results. Sources close to the "Sonny with a Chance" star tell us he is weak and barely able to stand.

UPDATE: Smith will appear on the show tonight to reveal the details of his condition.

Slashed 'Skating' Star -- All Bandaged-Up

"Skating with the Stars" pro Brooke Castile gave us the finger in L.A. last night -- hours after it was gashed open with a skate during rehearsals -- but it's not the only injury giving her serious trouble.

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'Skating' Star Slashed on Set -- 'Bleeding All Over'

Another medical emergency on "Skating with the Stars" -- this time involving bloodshed -- after one of the pros was slashed by her partner's skate during rehearsals.

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Brooke Castile was rehearsing for tonight's show with partner Jonny Moseley -- an Olympic gold medalist skier -- when she stumbled and fell and his skate sliced her finger down to the bone.

Brooke began "bleeding all over" -- and had to be taken to a local hospital where she's currently being stitched up.

But get this -- right now, Brooke is telling people she still plans on skating tonight.

'Skating with the Stars' Contestant Rushed to Hospital

"Skating with the Stars" contestant Brandon Smith was taken to a hospital moments ago after throwing up while on set ... TMZ has learned.

Sources tell TMZ ... a 911 call was made from the CBS lot in L.A. -- where the "Skating" set is located -- at 11:43 AM PT.

We're told Smith -- who stars in "Sonny with a Chance" with Demi Lovato -- was throwing up and having difficulty breathing ... and had to be taken by ambulance to a local hospital.

Sources connected with the show tell TMZ Brandon was sick when he arrived on set today -- and it's unclear if he'll be able to skate during tonight's show.

UPDATE 1:30 PM: A rep for the show tells TMZ, "He was throwing up on set and we think it is food poisoning."

UPDATE 3:40 PM: We're told Brandon will not be performing on tonight's show.