LiLo to welcome sibling?

Lindsay Lohan

Lindsay Lohan may soon welcome another half-sibling.

The 27-year-old former Mean Girls star’s father, Michael Lohan, reportedly confirmed to RadarOnline at the weekend his on-off girlfriend, Kate Major, is three-and-a-half months pregnant.

Kate, who shares a 16-month-old son, Lincoln, with the showbiz dad, is currently serving an eight-month prison sentence for a probation violation following her DUI arrest in March.

Gossip Extra reports the 31-year-old former reporter is fighting to complete her time at her home in Boca Raton, Florida, citing a high-risk pregnancy.

Kate and Michael are known to have a tumultuous relationship.

The couple became engaged in 2010 but broke up shortly after with Kate accusing him of harassment and assault.

They announced they were expecting their first child together in July 2012.

However, things appeared to go downhill once again in February of this year, when Kate claimed she was forced to lock herself and their child in a bedroom while Michael tried to break in with a weapon.

Taking to Twitter in an apparent cry for help, she wrote: “Threatening to take our son. What judge would rule for. him??? Stuck inside a house with this guy? He has a knife.”

Sources told TMZ at the time Michael called 911 after Kate began “acting erratically” and police intervened.

Lindsay, his daughter with ex-wife Dina, has had a notoriously difficult relationship with her dad, going through multiple periods of estrangement. In 2009 the pair fell out after he released recordings he’d made of her private voicemails to him. The actress was heard sobbing and claiming no one loved her. Michael claimed he made them public to show the world his daughter needed professional help.

In addition to Lindsay, Michael shares three other children with Dina. The former couple divorced in 2007 after 22 years of marriage.

He also has a teenage daughter, Ashley Horn, from a previous relationship, according to UsWeekly.

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