The net closes on Hunter Biden: First son's ex-girlfriend, 28 testifies for five hours to grand jury in tax probe about how he lived in Chateau Marmont for a month - where he learned to cook crack - and gave her thousands of dollars to spen

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Hunter Biden's ex-girlfriend told a grand jury she was instructed by the president's son to withdraw thousands of dollars from ATMs and the two partied at lavish hotels from coast to coast while Hunter was in the throes of drug addiction.

Zoe Kestan, 28, who goes by the social media handle weed_slut_420, testified for five hours at a federal courthouse in Joe Biden's home state of Delaware last Tuesday morning in the investigation focused on the president's son for alleged tax crimes. 

Kestan - a garment, lingerie and textile designer - faced a range of questions over what Hunter Biden was doing during his time with her and what his spending habits were like in 2018, when he admitted to learning to cook crack at the infamous Chateau Marmont in Beverly Hills. 

The pair had been seen going to the openings of art shows and were regularly spotted at parties together in Manhattan. 

Kestan told the grand jury she was instructed by Biden to take out 'thousands of dollars at a time' from cash machines. 

In her testimony, Kestan reeled off a list of pricey five-star New York City hotels, including the Soho Grand and Four Seasons, where she had stayed with Biden, reports the New York Post. 

She also detailed their West Coast hotels, which included celebrity hot spot Chateau Marmont, where the pair stayed together for a month. 

An ex-girlfriend of Hunter Biden, left, Zoe Kestan, 28, right, gave evidence at a federal courthouse in Joe Biden's home state of Delaware for several hours last Tuesday morning

Kestan, who is a lingerie designer, was subpoenaed to give evidence in the DOJ's secretive three-year probe into Hunter's murky financial affairs and business with China

The DOJ's is conducting a secretive three-year probe into Hunter's murky financial affairs and business with China

In his memoir Beautiful Things, released last year, Hunter reveals how he was banned from the legendary celebrity hangout because of 'drug use.' 

The money she took out at ATMs was used to buy clothes and food, but she explained she did not know how he came to have the funds, reports the Post. 

Kestan joined a growing list of former business partners and associates who have been subpoenaed to give evidence in the Department of Justice's secretive three-year probe into Hunter's murky financial affairs. 

Federal agents went directly to Kestan's New York City apartment where they served her with a subpoena to testify at the grand jury after her name came up during the broad investigation. 

She appeared directly after Hunter Biden's baby mama, Lunden Roberts, 30, sat for the grand jury. 

As well as having a three-year-old daughter with the president's son, who he refuses to publicly acknowledge, Roberts spent more than a year working in a junior position at his investment firm, Rosemont Seneca.      

The fashion designer, Kestan, pictured, spent months living in hotels with Biden in 2018 in New York and LA

The Marmont is infamous for its many stories of celebrities doing drugs and acting scandalous 

Kestan also reeled off a list of posh and price New York City and Los Angeles hotels including the Soho Grand, pictured above, where the couple stayed for a time

During her testimony, a source for the Post revealed how Kestan believes she is responsible for helping Hunter Biden turn sober, noting that she was 'with him at the craziest point of his life' and persuaded him to become a painter having explained how 'art was a great way to see a hopeful future, rather than using drugs.'  

This current probe is said to involve Hunter Biden's dealings overseas. 

Last month, JPMorgan Chase Bank was subpoenaed to hand over records of transactions between Hunter's various ventures and the Bank of China for the previous five years. 

The document offered the first real clues as to the specifics of Delaware U.S. Attorney David Weiss's probe, which was launched in late 2018 but controversially kept under wraps until weeks after the 2020 Presidential election, supposedly to avoid becoming a campaign issue.

Zoe Kestan and Hunter Biden were often seen at parties and art gallery openings together in Manhattan. Kestan is pictured at an event in Austin, Texas in 2019

CNN has reported that the investigation is focused on Hunter's business dealings in China while Politico claims it relates to whether he paid taxes on all of his income.

'I learned yesterday for the first time that the U.S. Attorney's Office in Delaware advised my legal counsel, also yesterday, that they are investigating my tax affairs,' Hunter announced in December 2020.

'I take this matter very seriously but I am confident that a professional and objective review of these matters will demonstrate that I handled my affairs legally and appropriately, including with the benefit of professional tax advisors.'

Lunden Roberts also gave evidence to the grand jury last week. Scandal-plagued Hunter claimed in his 2021 memoir that he had 'no recollection' of Roberts, nor the 'encounter' that led to the birth of their daughter, Navy Joan, in 2018.

Lunden Roberts also gave evidence at a federal courthouse in Joe Biden's home state of Delaware for several hours last Tuesday morning

Roberts, 30, was subpoenaed to give evidence in the Department of Justice's secretive three-year probe into Hunter's murky financial affairs. Left, Hunter Biden puts his mounting scandals aside to enjoy a two-hour lunch with friends at a fish restaurant in Malibu earlier this month

In his memoir, Beautiful Things, Hunter claimed he went on so many 'rampages' in the wake of his 2017 divorce from Kathleen Buhle that he couldn't recall his conquests

And he has never mentioned the little girl's name in public despite paying her mom a reported $2.5 million settlement after a court-ordered DNA test proved he was the dad.

DailyMail.com revealed last year that Hunter, 52,  had an affair with Roberts, he once hired her to work at Rosemont Seneca, his Washington, D.C.-based investment firm that now finds itself in the crosshairs of the federal inquiry.

It was initially reported that Hunter met Roberts while she was studying crime scene investigation in graduate school and working as a stripper at a DC club which he frequented. 

In his memoir, Biden says he has 'no recollection' of his 'encounter' with Roberts. 

'I was a mess, but a mess I've taken responsibility for it,' he writes.

Hunter Biden takes a stroll with his wife, Melissa, and their son while staying at the Greenwich Hotel, in Manhattan, New York last November